/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Primary palette – nature-inspired greens & teals */
    --primary-50: #ecfdf5;
    --primary-100: #d1fae5;
    --primary-200: #a7f3d0;
    --primary-300: #6ee7b7;
    --primary-400: #34d399;
    --primary-500: #10b981;
    --primary-600: #059669;
    --primary-700: #047857;
    --primary-800: #065f46;
    --primary-900: #064e3b;

    /* Neutrals */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* Semantic */
    --green: #22c55e;
    --yellow: #eab308;
    --orange: #f97316;
    --red: #ef4444;

    /* Surface & Glass */
    --surface: rgba(255, 255, 255, 0.72);
    --surface-hover: rgba(255, 255, 255, 0.88);
    --glass-border: rgba(255, 255, 255, 0.45);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
    --glass-shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.08);

    /* Typography */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 24px;

    /* Transitions */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: linear-gradient(145deg, #f0fdf4 0%, #ecfeff 35%, #f0f9ff 65%, #f0fdf4 100%);
    color: var(--gray-800);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== BACKGROUND DECORATION ===== */
.bg-decoration {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bg-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.35;
    animation: blobFloat 20s ease-in-out infinite;
}

.bg-blob-1 {
    width: 500px;
    height: 500px;
    background: var(--primary-200);
    top: -10%;
    right: -5%;
    animation-delay: 0s;
}

.bg-blob-2 {
    width: 400px;
    height: 400px;
    background: #a5f3fc;
    bottom: 10%;
    left: -8%;
    animation-delay: -7s;
}

.bg-blob-3 {
    width: 300px;
    height: 300px;
    background: #bbf7d0;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes blobFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -40px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(15px, 30px) scale(1.03); }
}

/* ===== HEADER ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    background: rgba(255, 255, 255, 0.65);
    border-bottom: 1px solid var(--glass-border);
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    cursor: default;
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-sm);
    color: white;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-700), var(--primary-500));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.nav {
    display: flex;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    transition: all 0.25s var(--ease);
}

.nav-link:hover {
    color: var(--primary-600);
    background: var(--primary-50);
}

.nav-link.active {
    color: var(--primary-700);
    background: var(--primary-50);
}

/* ===== MAIN ===== */
.main {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px 60px;
}

/* ===== HERO ===== */
.hero {
    text-align: center;
    padding: 64px 0 48px;
    animation: fadeInUp 0.8s var(--ease) both;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 100px;
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary-700);
    margin-bottom: 20px;
    letter-spacing: 0.02em;
}

.badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--primary-500);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.85); }
}

.hero-title {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.hero-highlight {
    background: linear-gradient(135deg, var(--primary-500), #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--gray-500);
    line-height: 1.7;
    max-width: 520px;
    margin: 0 auto;
    font-weight: 400;
}

/* ===== CALCULATOR CARD ===== */
.calculator-section {
    animation: fadeInUp 0.8s var(--ease) 0.15s both;
}

.calculator-card {
    background: var(--surface);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 36px;
    box-shadow: var(--glass-shadow-lg);
    transition: box-shadow 0.4s var(--ease);
}

.calculator-card:hover {
    box-shadow: 0 24px 68px rgba(0, 0, 0, 0.1);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 32px;
}

.card-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border: 1px solid var(--primary-200);
    border-radius: var(--radius-sm);
    color: var(--primary-600);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.01em;
}

.card-description {
    font-size: 0.85rem;
    color: var(--gray-400);
    margin-top: 2px;
}

/* ===== INPUT FIELDS ===== */
.input-group-row {
    display: flex;
    gap: 12px;
    align-items: flex-end;
    margin-bottom: 16px;
}

.input-group {
    flex: 1;
    position: relative;
}

.input-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--gray-600);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-label svg {
    color: var(--gray-400);
}

.input-field {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.95rem;
    color: var(--gray-800);
    background: rgba(255, 255, 255, 0.7);
    transition: all 0.25s var(--ease);
    outline: none;
}

.input-field::placeholder {
    color: var(--gray-300);
}

.input-field:focus {
    border-color: var(--primary-400);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
    background: white;
}

/* ===== AUTOCOMPLETE / SUGGESTIONS ===== */
.suggestions-list {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
    max-height: 220px;
    overflow-y: auto;
    z-index: 1000;
    padding: 6px;
    display: none;
}

.suggestions-list.visible {
    display: block;
    animation: slideDown 0.2s var(--ease-bounce);
}

.suggestion-item {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 0.9rem;
    color: var(--gray-700);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.15s ease;
}

.suggestion-item:hover,
.suggestion-item.highlighted {
    background: var(--primary-50);
    color: var(--primary-700);
}

.suggestion-state {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--gray-400);
    background: var(--gray-100);
    padding: 2px 6px;
    border-radius: 4px;
    text-transform: uppercase;
}

.suggestion-item:hover .suggestion-state,
.suggestion-item.highlighted .suggestion-state {
    background: var(--primary-100);
    color: var(--primary-700);
}

/* Swap Button */
.swap-btn-wrapper {
    padding-bottom: 4px;
}

.swap-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-sm);
    background: white;
    color: var(--gray-400);
    cursor: pointer;
    transition: all 0.25s var(--ease);
}

.swap-btn:hover {
    border-color: var(--primary-300);
    color: var(--primary-600);
    background: var(--primary-50);
    transform: rotate(180deg);
}

/* ===== MANUAL DISTANCE ===== */
.manual-distance-section {
    margin-bottom: 24px;
}

.toggle-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
    font-size: 0.85rem;
    color: var(--gray-500);
}

.toggle-checkbox {
    display: none;
}

.toggle-switch {
    position: relative;
    width: 40px;
    height: 22px;
    background: var(--gray-200);
    border-radius: 100px;
    transition: background 0.3s var(--ease);
    flex-shrink: 0;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s var(--ease-bounce);
}

.toggle-checkbox:checked + .toggle-switch {
    background: var(--primary-500);
}

.toggle-checkbox:checked + .toggle-switch::after {
    transform: translateX(18px);
}

.manual-input-wrapper {
    position: relative;
    margin-top: 12px;
    display: none;
}

.manual-input-wrapper.visible {
    display: block;
    animation: slideDown 0.3s var(--ease-bounce);
}

.input-suffix {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-400);
}

/* ===== TRANSPORT GRID ===== */
.transport-section {
    margin-bottom: 28px;
}

.transport-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 4px;
}

.transport-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 18px 8px 14px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    transition: all 0.3s var(--ease);
    font-family: var(--font);
}

.transport-card:hover {
    border-color: var(--primary-300);
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.1);
}

.transport-card.selected {
    border-color: var(--primary-500);
    background: linear-gradient(135deg, var(--primary-50), rgba(167, 243, 208, 0.3));
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.15);
}

.transport-card.selected .transport-icon {
    color: var(--primary-600);
}

.transport-icon {
    color: var(--gray-400);
    transition: color 0.3s var(--ease);
    height: 32px;
    display: flex;
    align-items: center;
}

.transport-name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--gray-700);
}

.transport-emission {
    font-size: 0.7rem;
    color: var(--gray-400);
    font-weight: 500;
}

/* ===== SUBMIT BUTTON ===== */
.submit-btn {
    width: 100%;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--ease);
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
    letter-spacing: 0.01em;
}

.submit-btn:hover {
    background: linear-gradient(135deg, var(--primary-600), var(--primary-700));
    box-shadow: 0 8px 28px rgba(16, 185, 129, 0.4);
    transform: translateY(-1px);
}

.submit-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

/* ===== LOADING ===== */
.loading-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    text-align: center;
}

.spinner-ring {
    width: 48px;
    height: 48px;
    border: 3px solid var(--primary-100);
    border-top-color: var(--primary-500);
    border-radius: 50%;
    margin: 0 auto 16px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    font-size: 0.95rem;
    color: var(--gray-500);
    font-weight: 500;
}

/* ===== RESULTS SECTION ===== */
.results-section {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    animation: fadeInUp 0.6s var(--ease) both;
}

.results-section.hidden {
    display: none;
}

.result-card {
    background: var(--surface);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--glass-shadow);
    animation: fadeInUp 0.5s var(--ease) both;
}

.result-card:nth-child(2) { animation-delay: 0.1s; }
.result-card:nth-child(3) { animation-delay: 0.2s; }
.result-card:nth-child(4) { animation-delay: 0.3s; }

.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.result-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

.route-icon {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    color: #3b82f6;
}

.emission-icon {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #d97706;
}

.compare-icon {
    background: linear-gradient(135deg, #f3e8ff, #e9d5ff);
    color: #9333ea;
}

.credits-icon {
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    color: var(--primary-600);
}

.result-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-800);
}

/* Route Summary */
.route-details {
    padding: 0 8px;
    margin-bottom: 20px;
}

.route-point {
    display: flex;
    align-items: center;
    gap: 14px;
}

.route-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.origin-dot {
    background: var(--primary-500);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15);
}

.destination-dot {
    background: #3b82f6;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.route-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.route-value {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gray-800);
}

.route-line {
    width: 2px;
    height: 24px;
    background: linear-gradient(var(--primary-300), #93c5fd);
    margin-left: 5px;
    border-radius: 2px;
}

.route-stats {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 16px 20px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--gray-400);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.stat-divider {
    width: 1px;
    height: 36px;
    background: var(--gray-200);
}

/* Emissions Card */
.emission-display {
    text-align: center;
    padding: 20px 0 16px;
}

.emission-value {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-600), #0d9488);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    letter-spacing: -0.03em;
}

.emission-unit {
    display: block;
    font-size: 1rem;
    color: var(--gray-400);
    font-weight: 500;
    margin-top: 6px;
}

.emission-context {
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray-500);
    padding: 12px 16px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    line-height: 1.5;
}

/* Comparison Bars */
.comparison-bars {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.comparison-item {
    display: flex;
    align-items: center;
    gap: 14px;
}

.comparison-label {
    width: 80px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--gray-600);
    text-align: right;
    flex-shrink: 0;
}

.comparison-bar-wrapper {
    flex: 1;
    height: 28px;
    background: var(--gray-100);
    border-radius: 100px;
    overflow: hidden;
    position: relative;
}

.comparison-bar {
    height: 100%;
    border-radius: 100px;
    transition: width 1s var(--ease-bounce);
    position: relative;
    min-width: 2px;
}

.comparison-bar.level-green {
    background: linear-gradient(90deg, #86efac, var(--green));
}

.comparison-bar.level-yellow {
    background: linear-gradient(90deg, #fde047, var(--yellow));
}

.comparison-bar.level-orange {
    background: linear-gradient(90deg, #fdba74, var(--orange));
}

.comparison-bar.level-red {
    background: linear-gradient(90deg, #fca5a5, var(--red));
}

.comparison-bar.active-transport {
    box-shadow: 0 0 0 2px white, 0 0 0 4px currentColor;
}

.comparison-value {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--gray-700);
    min-width: 65px;
    flex-shrink: 0;
}

/* Credits */
.credits-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.credit-item {
    padding: 20px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    text-align: center;
}

.credit-value {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.credit-cost {
    color: var(--primary-600) !important;
}

.credit-label {
    font-size: 0.78rem;
    color: var(--gray-400);
    font-weight: 500;
}

.credits-info {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 12px 16px;
    background: var(--primary-50);
    border: 1px solid var(--primary-100);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--primary-700);
    line-height: 1.5;
}

.credits-info svg {
    flex-shrink: 0;
    margin-top: 1px;
    color: var(--primary-500);
}

/* New Calculation Button */
.new-calc-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 8px auto 0;
    padding: 12px 28px;
    border: 1.5px solid var(--gray-200);
    border-radius: var(--radius-md);
    background: white;
    color: var(--gray-600);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s var(--ease);
}

.new-calc-btn:hover {
    border-color: var(--primary-300);
    color: var(--primary-600);
    background: var(--primary-50);
}

/* ===== ABOUT SECTION ===== */
.about-section {
    margin-top: 64px;
    animation: fadeInUp 0.8s var(--ease) 0.3s both;
}

.about-card {
    background: var(--surface);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--glass-shadow);
}

.about-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.about-text {
    font-size: 0.95rem;
    color: var(--gray-500);
    line-height: 1.7;
    max-width: 600px;
    margin-bottom: 28px;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.feature-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-50), var(--primary-100));
    border-radius: var(--radius-sm);
    color: var(--primary-600);
    flex-shrink: 0;
}

.feature-item h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 2px;
}

.feature-item p {
    font-size: 0.82rem;
    color: var(--gray-400);
    line-height: 1.5;
}

/* ===== FOOTER ===== */
.footer {
    position: relative;
    z-index: 1;
    margin-top: 48px;
    padding: 32px 24px;
    text-align: center;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.footer-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--gray-500);
}

.footer-sub {
    font-size: 0.78rem;
    color: var(--gray-400);
    margin-top: 4px;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .header-content {
        padding: 0 16px;
    }

    .main {
        padding: 0 16px 40px;
    }

    .hero {
        padding: 40px 0 32px;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .hero-subtitle br {
        display: none;
    }

    .calculator-card {
        padding: 24px 20px;
    }

    .input-group-row {
        flex-direction: column;
        gap: 0;
    }

    .swap-btn-wrapper {
        display: flex;
        justify-content: center;
        padding: 8px 0;
    }

    .swap-btn:hover {
        transform: rotate(90deg);
    }

    .transport-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .result-card {
        padding: 20px;
    }

    .credits-grid {
        grid-template-columns: 1fr;
    }

    .emission-value {
        font-size: 2.5rem;
    }

    .about-card {
        padding: 28px 20px;
    }

    .route-stats {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .stat-divider {
        width: 100%;
        height: 1px;
    }
}

@media (max-width: 480px) {
    .nav-link {
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .comparison-label {
        width: 60px;
        font-size: 0.75rem;
    }
}