/* Main Styles */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #20c997;
    --accent-color: #3bc9db;
    --light-bg: #f8f9fa;
    --dark-text: #212529;
    --light-text: #f8f9fa;
    --gray-text: #6c757d;
    --border-radius: 10px;
    --shadow-sm: 0 2px 5px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 5px 10px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 20px -3px rgba(0,0,0,0.12), 0 4px 8px -4px rgba(0,0,0,0.07);
    --transition: all 0.3s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.7;
    color: var(--dark-text);
    background-color: var(--light-bg);
    overflow-x: hidden;
    background-image: linear-gradient(to right, rgba(248, 249, 250, 0.8), rgba(233, 236, 239, 0.8));
}

.container {
    width: 95%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header & Navigation */
header {
    background-color: var(--primary-color);
    color: var(--light-text);
    padding: 1.2rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--secondary-color);
    background-image: linear-gradient(to right, var(--primary-color), #34495e);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: -0.5px;
    background: linear-gradient(120deg, var(--light-text), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    color: var(--light-text);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem;
    position: relative;
    transition: var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--secondary-color);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a.active {
    color: var(--secondary-color);
    font-weight: 600;
}

.nav-links.auth-links {
    gap: 1rem;
    margin-left: auto;
}

.btn-signup {
    background: var(--secondary-color);
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: var(--transition);
}

.btn-signup:hover {
    background: #12b886;
    transform: translateY(-2px);
}

.btn-signup::after {
    display: none;
}

.language-selector {
    margin: 0.5rem 1rem;
    text-align: right;
}

.lang-btn {
    padding: 0.4rem 0.8rem;
    background: transparent;
    border: 2px solid var(--secondary-color);
    color: var(--light-text);
    border-radius: var(--border-radius);
    text-decoration: none;
    margin-left: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    transition: var(--transition);
}

.lang-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(32, 201, 151, 0.4);
}

.lang-btn.active {
    background-color: var(--secondary-color);
    color: var(--light-text);
    border-color: var(--secondary-color);
}

/* Content Styles */
main {
    padding: 3rem 0;
}

h1 {
    font-size: 2.4rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
}

h1::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    border-radius: 2px;
}

h2 {
    font-size: 2rem;
    margin: 2rem 0 1.25rem;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: -0.3px;
}

h3 {
    font-size: 1.6rem;
    margin: 1.5rem 0 1rem;
    color: var(--secondary-color);
    font-weight: 600;
}

p {
    margin-bottom: 1.25rem;
    color: var(--dark-text);
    line-height: 1.7;
}

/* Calculator Containers */
.calculator-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-top: 2.5rem;
    gap: 2.5rem;
}

.input-section, .results-section {
    flex: 1;
    min-width: 300px;
    background-color: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid var(--secondary-color);
}

.input-section:hover, .results-section:hover {
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.625rem;
    font-weight: 600;
    color: var(--primary-color);
}

input, select {
    width: 100%;
    padding: 0.9rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.2);
}

small {
    display: block;
    color: var(--gray-text);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* Buttons */
.btn-primary {
    display: inline-block;
    background-color: var(--secondary-color);
    color: white;
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.btn-primary:hover {
    background-color: #12b886;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(32, 201, 151, 0.4);
}

/* Result Cards */
.result-card {
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--secondary-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.result-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.result-value {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0.75rem 0;
    letter-spacing: -0.5px;
}

.result-range {
    font-size: 1.6rem;
    color: var(--primary-color);
    margin: 0.75rem 0;
    font-weight: 600;
}

.result-description {
    color: var(--gray-text);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-top: 0.75rem;
}

.result-info, .result-recommendation {
    margin-bottom: 1.5rem;
    padding: 1.25rem;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--secondary-color);
}

/* Status Colors */
.speed-slow {
    border-left-color: #fa5252;
}

.speed-optimal {
    border-left-color: #12b886;
}

.speed-fast {
    border-left-color: #1098ad;
}

.speed-slow span {
    color: #fa5252;
}

.speed-optimal span {
    color: #12b886;
}

.speed-fast span {
    color: #1098ad;
}

/* Speed Gauge */
.speed-gauge {
    margin-top: 2.5rem;
    text-align: center;
}

/* Status Indicators */
.status {
    padding: 0.4rem 0.8rem;
    border-radius: var(--border-radius);
    display: inline-block;
    font-weight: 600;
    font-size: 0.9rem;
}

.status-slow {
    background-color: #ffe3e3;
    color: #fa5252;
    border: 1px solid rgba(250, 82, 82, 0.3);
}

.status-optimal {
    background-color: #d3f9ee;
    color: #12b886;
    border: 1px solid rgba(18, 184, 134, 0.3);
}

.status-fast {
    background-color: #e3fafc;
    color: #1098ad;
    border: 1px solid rgba(16, 152, 173, 0.3);
}

/* VFD Result */
.vfd-result {
    border-left-color: #748ffc;
    background-color: #e5edff;
}

/* Steel Info Container */
.steel-info-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 1.5rem;
}

.steel-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid var(--secondary-color);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    background: linear-gradient(to bottom, #ffffff, #f9fafc);
}

.steel-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.steel-card h3 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.75rem;
    margin-bottom: 1.5rem;
    font-size: 1.6rem;
    font-weight: 700;
}

.properties-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.property {
    display: flex;
    flex-direction: column;
}

.property-name {
    font-weight: 600;
    margin-bottom: 0.625rem;
    color: var(--primary-color);
}

.property-bar {
    height: 0.85rem;
    background-color: #edf2f7;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.15);
    margin-bottom: 0.5rem;
}

.property-value, .property-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 0.375rem;
    transition: width 0.8s ease-out;
    min-width: 5px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.grinding-notes {
    margin-top: 1.5rem;
    padding: 1.25rem;
    background-color: #fffbeb;
    border-left: 4px solid var(--accent-color);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    line-height: 1.6;
}

.back-link {
    display: inline-flex;
    align-items: center;
    margin: 1.5rem 0;
    color: var(--primary-color);
    background-color: rgba(32, 201, 151, 0.15);
    text-decoration: none;
    font-weight: 700;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.back-link:hover {
    color: var(--primary-color);
    background-color: rgba(32, 201, 151, 0.25);
    transform: translateX(-5px);
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

.back-link::before {
    content: '←';
    margin-right: 0.8rem;
    font-size: 1.3rem;
    font-weight: 800;
}

/* Tool Cards */
.welcome-section {
    margin-top: 2rem;
}

.tool-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2.5rem;
}

.tool-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid var(--secondary-color);
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.tool-card h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin: 0 0 1rem;
    font-weight: 700;
}

.tool-card p {
    color: var(--gray-text);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

/* Footer */
footer {
    text-align: center;
    padding: 2.5rem 0;
    background-color: var(--primary-color);
    color: var(--light-text);
    margin-top: 3rem;
    border-top: 3px solid var(--secondary-color);
    background-image: linear-gradient(to right, var(--primary-color), #34495e);
}

footer p {
    font-size: 1rem;
    opacity: 0.9;
    color: var(--light-text);
    margin-bottom: 0;
}

/* Mobile Menu Button */
.mobile-menu-button {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 22px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 10;
}

.mobile-menu-button span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: var(--light-text);
    border-radius: 3px;
    transition: var(--transition);
}

.mobile-menu-button.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
    background-color: var(--accent-color);
}

.mobile-menu-button.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-button.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
    background-color: var(--accent-color);
}

/* Responsive Styles */
@media (max-width: 768px) {
    .calculator-container {
        flex-direction: column;
    }

    nav {
        position: relative;
        justify-content: space-between;
        padding: 1rem;
        flex-wrap: wrap;
    }

    .mobile-menu-button {
        display: flex;
    }

    .nav-links {
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: #2c3e50;
        display: none;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        z-index: 100;
        margin-left: 0;
    }

    .nav-links.show {
        display: flex;
    }

    .nav-links.auth-links {
        margin-left: 0;
    }

    .nav-links li {
        margin: 0;
        text-align: center;
        padding: 1rem 0;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .nav-links li:last-child {
        border-bottom: none;
    }

    .btn-signup {
        display: block;
        width: auto;
        margin: 0 auto;
    }

    .language-selector {
        text-align: center;
        margin: 0.75rem 0;
    }
}

/* Errors */
.error {
    color: #e74c3c;
    padding: 1rem;
    background-color: #ffecec;
    border-radius: 4px;
    margin: 1rem 0;
}

/* About Page Styles */
.about-page {
    max-width: 1000px;
    margin: 0 auto;
}

.about-section {
    margin-bottom: 3rem;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.about-section h2 {
    background-color: var(--primary-color);
    color: var(--light-text);
    margin: 0;
    padding: 1.25rem 1.5rem;
    font-size: 1.5rem;
    border-bottom: 3px solid var(--secondary-color);
}

.about-content {
    padding: 1.5rem 2rem;
}

.about-content h3 {
    color: var(--secondary-color);
    font-size: 1.3rem;
    margin: 1.5rem 0 0.75rem;
}

.about-content h3:first-child {
    margin-top: 0;
}

.about-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.about-content ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.about-content ul li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.disclaimer {
    border-left: 4px solid #fa5252;
    background-color: #fff5f5;
}

.disclaimer p strong {
    color: #fa5252;
}

.about-content a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.about-content a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}
/* ===============================================
   STEEL SELECTOR - MODERN REDESIGN
   =============================================== */

/* Page Header */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.header-icon {
    font-size: 2.5rem;
}

.page-subtitle {
    font-size: 1.1rem;
    color: var(--gray-text);
    max-width: 600px;
    margin: 0 auto;
}

/* Main Layout */
.steel-selector-layout {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 2rem;
    align-items: start;
}

/* Sidebar */
.selector-sidebar {
    position: sticky;
    top: 100px;
}

.selector-form-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--secondary-color);
}

.selector-form-card h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Modern Form Groups */
.form-group-modern {
    margin-bottom: 2rem;
}

.form-group-modern:last-of-type {
    margin-bottom: 1.5rem;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.slider-header label {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.property-icon {
    font-size: 1.2rem;
}

.slider-value {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9rem;
    min-width: 35px;
    text-align: center;
}

/* Modern Slider */
.modern-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: linear-gradient(to right, #e9ecef 0%, var(--secondary-color) 50%, var(--accent-color) 100%);
    outline: none;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.modern-slider:hover {
    opacity: 1;
}

.modern-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--secondary-color);
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: all 0.2s;
}

.modern-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    border-color: var(--accent-color);
}

.modern-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: white;
    border: 3px solid var(--secondary-color);
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: all 0.2s;
}

.modern-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    border-color: var(--accent-color);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--gray-text);
}

/* Modern Select */
.modern-select {
    width: 100%;
    padding: 0.85rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    background: white;
    cursor: pointer;
    transition: var(--transition);
    color: var(--dark-text);
    font-weight: 500;
}

.modern-select:hover {
    border-color: var(--secondary-color);
}

.modern-select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(32, 201, 151, 0.1);
}

/* Button Group */
.button-group {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.btn-large {
    flex: 1;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary.btn-large {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
}

.btn-primary.btn-large:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary.btn-large {
    background: white;
    color: var(--gray-text);
    border: 2px solid #e9ecef;
}

.btn-secondary.btn-large:hover {
    background: #f8f9fa;
    border-color: var(--gray-text);
}

.btn-icon {
    font-size: 1.2rem;
}

/* Results Section */
.results-main {
    min-height: 500px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e9ecef;
}

.results-header h2 {
    font-size: 1.8rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.results-count {
    background: var(--secondary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

/* No Results Card */
.no-results-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 4rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 2px dashed #e9ecef;
}

.no-results-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.no-results-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.no-results-text {
    font-size: 1.1rem;
    color: var(--gray-text);
    max-width: 500px;
    margin: 0 auto;
}

/* Steel Results Grid */
.steel-results {
    display: grid;
    gap: 1.5rem;
}

/* Updated Steel Card */
.steel-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-left: 5px solid var(--secondary-color);
    position: relative;
    overflow: hidden;
}

.steel-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
}

.steel-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.steel-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #f8f9fa;
}

.steel-card-header h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin: 0;
    border: none;
    padding: 0;
}

.match-percentage {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-weight: 700;
    font-size: 1.1rem;
    box-shadow: 0 2px 8px rgba(32, 201, 151, 0.3);
}

/* Steel Properties Bars */
.steel-properties {
    display: grid;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.property {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.property-name {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.property-bar {
    height: 12px;
    background: #f1f3f5;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

.property-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color), var(--accent-color));
    border-radius: 10px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(32, 201, 151, 0.3);
}

/* Steel Description */
.steel-description {
    background: #f8f9fa;
    padding: 1.25rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--accent-color);
}

.steel-description p {
    color: var(--dark-text);
    line-height: 1.7;
    margin: 0;
}

/* Steel Properties List */
.steel-properties-list {
    margin-top: 1.5rem;
}

.steel-properties-list h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.steel-properties-list ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.steel-properties-list li {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--dark-text);
    border: 1px solid #dee2e6;
    transition: var(--transition);
}

.steel-properties-list li:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    border-color: var(--secondary-color);
    transform: translateY(-2px);
}

/* Loading State */
.loading {
    text-align: center;
    padding: 3rem;
    font-size: 1.2rem;
    color: var(--gray-text);
}

.error {
    background: #ffe5e5;
    color: #d32f2f;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    border-left: 4px solid #d32f2f;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .steel-selector-layout {
        grid-template-columns: 1fr;
    }
    
    .selector-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .page-header h1 {
        font-size: 2rem;
    }
    
    .page-subtitle {
        font-size: 1rem;
    }
    
    .selector-form-card {
        padding: 1.5rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .steel-card {
        padding: 1.5rem;
    }
    
    .steel-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .match-percentage {
        align-self: flex-start;
    }
}

/* ===============================================
   CALCULATORS - MODERN REDESIGN
   =============================================== */

/* Calculator Layout (same as steel selector) */
.calculator-layout {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 2rem;
    align-items: start;
}

.calculator-sidebar {
    position: sticky;
    top: 100px;
}

.calculator-form-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--accent-color);
}

.calculator-form-card h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Calculator Form Groups */
.form-group-calc {
    margin-bottom: 1.75rem;
}

.form-group-calc label {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.calc-icon {
    font-size: 1.2rem;
}

.input-with-value {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.calc-input {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    transition: var(--transition);
}

.calc-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 201, 219, 0.1);
}

.input-unit {
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    color: white;
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    font-weight: 700;
    font-size: 0.9rem;
    min-width: 50px;
    text-align: center;
}

/* Grind Visualization Card */
.grind-visualization-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    border-left: 5px solid var(--accent-color);
}

.grind-visualization-card h3 {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.grind-visualization-card canvas {
    display: block;
    margin: 0 auto;
    background: #f8f9fa;
    border-radius: 8px;
    padding: 1rem;
}

/* Grind Results Data */
.grind-results-data {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border-left: 5px solid var(--secondary-color);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #f1f3f5;
    transition: var(--transition);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item:hover {
    background: #f8f9fa;
}

.result-label {
    font-weight: 600;
    color: var(--gray-text);
    font-size: 0.95rem;
}

.result-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Grind Notes */
.grind-notes {
    background: linear-gradient(135deg, #e3f2fd, #f1f8e9);
    border-left: 4px solid var(--accent-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.grind-notes h4 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.grind-notes h4::before {
    content: '💡';
    font-size: 1.2rem;
}

.grind-notes p {
    color: var(--dark-text);
    line-height: 1.7;
    margin: 0;
}

/* Speed Calculator Specific */
.speed-results-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.speed-gauge {
    background: linear-gradient(to right, #ff6b6b 0%, #ffd93d 30%, #6bcf7f 60%, #ff6b6b 100%);
    height: 30px;
    border-radius: 15px;
    position: relative;
    margin: 2rem 0;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.speed-indicator {
    position: absolute;
    top: -10px;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 700;
    box-shadow: var(--shadow);
    transition: left 0.5s ease;
}

.speed-indicator::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 8px solid var(--primary-color);
}

.speed-zones {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--gray-text);
}

.speed-zone {
    flex: 1;
    text-align: center;
    padding: 0.5rem;
}

.speed-zone.optimal {
    font-weight: 700;
    color: var(--secondary-color);
}

/* Recommendations Grid */
.recommendations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.recommendation-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border-top: 3px solid var(--accent-color);
    transition: var(--transition);
}

.recommendation-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.recommendation-card h4 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.recommendation-card .value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    display: block;
    margin: 0.5rem 0;
}

.recommendation-card .description {
    color: var(--gray-text);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Warning/Info Boxes */
.info-box {
    background: linear-gradient(135deg, #e3f2fd, #f1f8e9);
    border-left: 4px solid #2196f3;
    border-radius: var(--border-radius);
    padding: 1.25rem;
    margin: 1.5rem 0;
}

.warning-box {
    background: linear-gradient(135deg, #fff3e0, #ffe0b2);
    border-left: 4px solid #ff9800;
    border-radius: var(--border-radius);
    padding: 1.25rem;
    margin: 1.5rem 0;
}

.info-box p, .warning-box p {
    margin: 0;
    color: var(--dark-text);
    line-height: 1.7;
}

.info-box::before {
    content: 'ℹ️ ';
    font-size: 1.2rem;
}

.warning-box::before {
    content: '⚠️ ';
    font-size: 1.2rem;
}

/* Responsive Calculators */
@media (max-width: 1024px) {
    .calculator-layout {
        grid-template-columns: 1fr;
    }
    
    .calculator-sidebar {
        position: static;
    }
    
    .grind-visualization-card canvas {
        max-width: 100%;
        height: auto;
    }
}

@media (max-width: 768px) {
    .calculator-form-card {
        padding: 1.5rem;
    }
    
    .recommendations-grid {
        grid-template-columns: 1fr;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
}

/* ==================================================================
   REFINED CRAFTSMAN THEME  —  KnifeMaker Tools redesign (2026-07-04)
   Appended override layer. Re-skins the existing component system
   (walnut / bone / forge-ember / brass) without altering layout.
   ================================================================== */

:root {
    /* Warm artisan palette */
    --primary-color: #3a2c20;   /* deep walnut — nav, footer, heading ink */
    --secondary-color: #b0522c; /* forge ember — primary accent / CTA */
    --accent-color: #c1873c;    /* heated brass — secondary accent */
    --light-bg: #f4eee1;        /* warm bone paper */
    --dark-text: #2b2620;       /* aged ink */
    --light-text: #f7f1e5;      /* warm cream (on walnut) */
    --gray-text: #796d5c;       /* muted taupe */
    --border-radius: 9px;
    --shadow-sm: 0 1px 2px rgba(58,44,32,.08), 0 2px 6px rgba(58,44,32,.05);
    --shadow: 0 4px 14px -4px rgba(58,44,32,.16), 0 2px 6px -2px rgba(58,44,32,.10);
    --shadow-lg: 0 16px 34px -10px rgba(58,44,32,.24), 0 6px 14px -6px rgba(58,44,32,.14);
    --transition: all .28s cubic-bezier(.4,0,.2,1);

    /* New tokens */
    --walnut-deep: #2b2017;
    --ember-hover: #97401f;
    --brass: #b7893f;
    --patina: #4e6b67;          /* cool steel-teal, used sparingly */
    --surface: #fdfbf5;         /* warm card white */
    --parchment: #f6efdf;       /* callout background */
    --line: #e6dcc8;            /* warm hairline border */
    --ink-soft: #6f6350;
}

/* ---- Fonts: Fraunces (display serif) + Source Sans 3 (body) ---- */
body {
    font-family: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--dark-text);
    background-color: var(--light-bg);
    background-image:
        radial-gradient(1200px 600px at 100% -10%, rgba(176,82,44,.05), transparent 60%),
        linear-gradient(180deg, #f6f0e4, #efe6d4);
    background-attachment: fixed;
    line-height: 1.72;
}

h1, h2, h3, .logo, .page-header h1, .tool-card h2, .steel-card h3,
.results-header h2, .calculator-form-card h2, .selector-form-card h2,
.hero-title, .about-section h2 {
    font-family: 'Fraunces', Georgia, 'Times New Roman', serif;
    font-optical-sizing: auto;
    letter-spacing: -.01em;
}

h1 { color: var(--primary-color); font-weight: 600; }
h2 { color: var(--primary-color); font-weight: 600; }
h3 { color: var(--secondary-color); font-weight: 600; }

h1::after { background: linear-gradient(to right, var(--secondary-color), var(--brass)); height: 3px; }

/* ---- Header / nav ---- */
header {
    background-color: var(--walnut-deep);
    background-image: linear-gradient(120deg, var(--walnut-deep), #43301f 60%, #4a3524);
    border-bottom: 3px solid var(--secondary-color);
    box-shadow: 0 2px 18px -6px rgba(43,32,23,.6);
}
.logo {
    font-weight: 600;
    text-transform: none;
    letter-spacing: -.01em;
    background: none;
    -webkit-text-fill-color: currentColor;
    color: var(--light-text);
    display: inline-flex;
    align-items: baseline;
    gap: .1ch;
}
.logo::before { content: '⚒'; color: var(--secondary-color); margin-right: .45rem; -webkit-text-fill-color: var(--secondary-color); font-size: .9em; }
.nav-links a { color: var(--light-text); font-weight: 500; letter-spacing: .01em; }
.nav-links a::after { background-color: var(--secondary-color); height: 2px; }
.nav-links a:hover, .nav-links a.active { color: #f0c9a0; }
.nav-links a.active { color: #efb98f; }

.btn-signup { background: var(--secondary-color); border-radius: 7px; }
.btn-signup:hover { background: var(--ember-hover); }

.lang-btn { border: 1.5px solid rgba(247,241,229,.5); color: var(--light-text); border-radius: 7px; font-weight: 600; }
.lang-btn:hover { box-shadow: 0 2px 10px rgba(176,82,44,.4); border-color: var(--secondary-color); }
.lang-btn.active { background-color: var(--secondary-color); border-color: var(--secondary-color); }

/* ---- Buttons ---- */
.btn-primary { background-color: var(--secondary-color); border-radius: 7px; box-shadow: 0 2px 6px rgba(151,64,31,.28); font-weight: 600; letter-spacing: .01em; }
.btn-primary:hover { background-color: var(--ember-hover); box-shadow: 0 6px 16px rgba(151,64,31,.34); }
.btn-primary.btn-large { background: linear-gradient(135deg, var(--secondary-color), #a24523); }
.btn-primary.btn-large:hover { box-shadow: var(--shadow-lg); }
.btn-secondary.btn-large { background: var(--surface); color: var(--primary-color); border: 1.5px solid var(--line); }
.btn-secondary.btn-large:hover { background: var(--parchment); border-color: var(--brass); }

/* ---- Cards & surfaces ---- */
.input-section, .results-section,
.tool-card, .steel-card, .selector-form-card, .calculator-form-card,
.grind-visualization-card, .grind-results-data, .speed-results-card,
.recommendation-card, .no-results-card, .about-section {
    background-color: var(--surface);
    border-color: var(--line);
}
.input-section, .results-section, .tool-card, .selector-form-card { border-top-color: var(--secondary-color); }
.calculator-form-card, .grind-visualization-card, .grind-results-data { border-top-color: var(--brass); }
.tool-card { border: 1px solid var(--line); border-top: 4px solid var(--secondary-color); }
.tool-card h2 { color: var(--primary-color); font-size: 1.45rem; }
.tool-card p { color: var(--ink-soft); }
.steel-card { background: var(--surface); border-left-color: var(--secondary-color); }
.steel-card::before { background: linear-gradient(to right, var(--secondary-color), var(--brass)); }
.steel-card h3 { border-bottom-color: var(--secondary-color); color: var(--primary-color); }

/* ---- Forms, sliders, selects ---- */
input, select, .calc-input, .modern-select { border-color: var(--line); background: #fffdf8; }
input:focus, select:focus, .calc-input:focus, .modern-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(176,82,44,.16);
}
.modern-select:hover { border-color: var(--brass); }
label, .form-group-calc label, .slider-header label { color: var(--primary-color); }
.modern-slider { background: linear-gradient(to right, #e7ddca 0%, var(--brass) 50%, var(--secondary-color) 100%); height: 8px; }
.modern-slider::-webkit-slider-thumb { border: 3px solid var(--secondary-color); background: #fffdf8; }
.modern-slider::-webkit-slider-thumb:hover { border-color: var(--brass); }
.modern-slider::-moz-range-thumb { border: 3px solid var(--secondary-color); background: #fffdf8; }
.slider-value, .input-unit, .match-percentage, .results-count, .steel-properties-list li:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--brass));
}

/* ---- Property bars (steel ratings) ---- */
.property-bar { background: #ece2cf; box-shadow: inset 0 1px 3px rgba(58,44,32,.14); }
.property-fill, .property-value { background: linear-gradient(90deg, var(--secondary-color), var(--brass)); box-shadow: 0 1px 3px rgba(176,82,44,.3); }

/* ---- Result values / accents that used gradient text ---- */
.result-value { color: var(--primary-color); }
.grind-results-data .result-value {
    background: linear-gradient(135deg, var(--secondary-color), var(--brass));
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.recommendation-card .value { color: var(--secondary-color); }
.recommendation-card { border-top-color: var(--brass); }

/* ---- Callout / info / notes boxes → warm parchment ---- */
.info-box, .grind-notes, .steel-description {
    background: var(--parchment);
    border-left: 4px solid var(--secondary-color);
    border-radius: var(--border-radius);
}
.info-box::before { content: '❧ '; }
.warning-box { background: #fbeede; border-left: 4px solid var(--accent-color); }
.grind-notes h4::before { content: '❧'; }
.disclaimer { background: #fbeae2; border-left-color: var(--secondary-color); }
.disclaimer p strong { color: var(--secondary-color); }

/* ---- Back link ---- */
.back-link { background-color: rgba(176,82,44,.12); color: var(--primary-color); border-radius: 7px; }
.back-link:hover { background-color: rgba(176,82,44,.2); }

/* ---- About page header bars ---- */
.about-section h2 { background-color: var(--walnut-deep); background-image: linear-gradient(120deg, var(--walnut-deep), #43301f); border-bottom-color: var(--secondary-color); color: var(--light-text); }
.about-content h3 { color: var(--secondary-color); }
.about-content a { color: var(--secondary-color); }
.about-content a:hover { color: var(--primary-color); }

/* ---- Footer ---- */
footer { background-color: var(--walnut-deep); background-image: linear-gradient(120deg, var(--walnut-deep), #43301f); border-top: 3px solid var(--secondary-color); }

/* ==================================================================
   NEW COMPONENTS
   ================================================================== */

/* Hero (homepage) */
.hero {
    position: relative;
    margin: -.5rem 0 2.5rem;
    padding: 3.5rem 2.5rem;
    border-radius: 14px;
    background:
        radial-gradient(900px 380px at 88% -20%, rgba(176,82,44,.16), transparent 60%),
        linear-gradient(135deg, #35271b, #4a3524 70%, #57402c);
    color: var(--light-text);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}
.hero::after {
    content: ''; position: absolute; inset: 0;
    background-image: linear-gradient(90deg, transparent 0 calc(100% - 4px), var(--brass) 0);
    opacity: .0;
}
.hero-eyebrow { text-transform: uppercase; letter-spacing: .22em; font-size: .78rem; font-weight: 700; color: var(--brass); margin-bottom: 1rem; }
.hero-title { font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.05; font-weight: 600; color: #fdf7ec; margin: 0 0 1rem; max-width: 18ch; }
.hero-title em { font-style: italic; color: #eba874; }
.hero-lead { font-size: 1.18rem; max-width: 54ch; color: #e7d8c4; margin-bottom: 1.8rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; }
.hero .btn-primary { background: var(--secondary-color); padding: .95rem 1.9rem; font-size: 1.05rem; }
.hero .btn-ghost {
    display: inline-block; padding: .95rem 1.7rem; border-radius: 7px;
    border: 1.5px solid rgba(247,241,229,.45); color: var(--light-text);
    text-decoration: none; font-weight: 600; transition: var(--transition);
}
.hero .btn-ghost:hover { background: rgba(247,241,229,.1); border-color: var(--brass); }

/* Section intro / lead paragraph */
.section-intro { max-width: 66ch; color: var(--ink-soft); font-size: 1.1rem; margin: 0 auto 2.2rem; text-align: center; }
.lead { font-size: 1.15rem; color: var(--ink-soft); }
.eyebrow { text-transform: uppercase; letter-spacing: .18em; font-size: .78rem; font-weight: 700; color: var(--secondary-color); }

/* Progressive disclosure — "Learn more" */
details.learn-more {
    background: var(--surface);
    border: 1px solid var(--line);
    border-left: 3px solid var(--brass);
    border-radius: 8px;
    margin: 1.1rem 0;
    overflow: hidden;
    transition: var(--transition);
}
details.learn-more[open] { box-shadow: var(--shadow-sm); }
details.learn-more > summary {
    cursor: pointer; list-style: none; padding: .95rem 1.2rem;
    font-weight: 600; color: var(--primary-color);
    display: flex; align-items: center; gap: .6rem;
}
details.learn-more > summary::-webkit-details-marker { display: none; }
details.learn-more > summary::before { content: '＋'; color: var(--secondary-color); font-weight: 700; transition: transform .2s; }
details.learn-more[open] > summary::before { content: '−'; }
details.learn-more > summary:hover { color: var(--secondary-color); }
details.learn-more .lm-body { padding: 0 1.2rem 1.2rem; color: var(--ink-soft); line-height: 1.75; }
details.learn-more .lm-body p { margin-bottom: .9rem; color: var(--ink-soft); }
details.learn-more .lm-body ul { margin: 0 0 .9rem 1.2rem; }
details.learn-more .lm-body li { margin-bottom: .4rem; }

/* Tip / note inline */
.tip { display: block; background: var(--parchment); border-left: 3px solid var(--brass); border-radius: 7px; padding: .9rem 1.1rem; margin: 1rem 0; color: var(--ink-soft); font-size: .98rem; }
.tip strong { color: var(--primary-color); }

/* Steps (guides) */
.step-list { counter-reset: step; list-style: none; margin: 1.5rem 0; }
.step-list > li { position: relative; padding: 0 0 1.6rem 3.4rem; }
.step-list > li::before {
    counter-increment: step; content: counter(step);
    position: absolute; left: 0; top: -.1rem;
    width: 2.3rem; height: 2.3rem; border-radius: 50%;
    background: linear-gradient(135deg, var(--secondary-color), var(--brass));
    color: #fff; font-family: 'Fraunces', serif; font-weight: 600;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 2px 6px rgba(176,82,44,.3);
}
.step-list > li:not(:last-child)::after { content: ''; position: absolute; left: 1.13rem; top: 2.4rem; bottom: .2rem; width: 2px; background: var(--line); }
.step-list h4 { margin: 0 0 .4rem; color: var(--primary-color); font-size: 1.15rem; }

/* Skill badges */
.skill-badge { display: inline-block; padding: .2rem .7rem; border-radius: 20px; font-size: .74rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; }
.skill-beginner { background: #e7efe3; color: #4c6b3f; }
.skill-intermediate { background: #f6ecd9; color: #8a6a2a; }
.skill-advanced { background: #f4e2da; color: #97401f; }

/* Divider */
.rule-forged { border: 0; height: 2px; background: linear-gradient(to right, transparent, var(--brass), transparent); margin: 2.5rem 0; }

/* ==================================================================
   RESPONSIVE / MOBILE ENHANCEMENTS
   ================================================================== */
@media (max-width: 768px) {
    .nav-links { background-color: var(--walnut-deep); border-top: 1px solid rgba(247,241,229,.12); }
    .hero { padding: 2.4rem 1.5rem; border-radius: 12px; }
    main { padding: 2rem 0; }
    .container { padding: 0 18px; }
    h1 { font-size: 2rem; }
    /* Comfortable tap targets everywhere */
    .btn-primary, .btn-large, .lang-btn, .btn-ghost { min-height: 48px; }
    .nav-links a { padding: .9rem; font-size: 1.05rem; }
}

/* Small phones */
@media (max-width: 420px) {
    .container { width: 100%; padding: 0 14px; }
    .hero-title { font-size: 1.9rem; }
    .hero-lead { font-size: 1.05rem; }
}

/* ---- Homepage tool cards (clickable, categorized) ---- */
a.tool-card { text-decoration: none; color: inherit; }
a.tool-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-top-color: var(--secondary-color); }
.tool-card { position: relative; }
.tool-ic { font-size: 2.1rem; line-height: 1; display: block; margin-bottom: .7rem; }
.tool-tag { display: inline-block; align-self: flex-start; padding: .18rem .65rem; border-radius: 20px;
    font-size: .68rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; margin-bottom: .8rem; }
.tag-ref { background: #efe7d6; color: #8a6a2a; }
.tag-calc { background: #f3e0d6; color: #97401f; }
.tag-learn { background: #e6efe1; color: #4c6b3f; }
.tool-card h2 { margin: 0 0 .6rem; }
.tool-cta { margin-top: auto; padding-top: .4rem; color: var(--secondary-color); font-weight: 700; letter-spacing: .01em; transition: var(--transition); }
a.tool-card:hover .tool-cta { color: var(--ember-hover); padding-left: .3rem; }

/* ---- "New to knife making" orientation ---- */
.start-here { max-width: 760px; margin: 0 auto 1rem; }
.start-here > h2 { text-align: center; }
.start-here > .lead { text-align: center; margin-bottom: 2rem; }