/* styles.css */
:root {
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-tertiary: #64748b;
    --border-color: #e2e8f0;
    --border-focus: #3b82f6;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #eff6ff;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --error-bg: #fef2f2;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 40px -8px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1100px;
    --header-height: 64px;
    --partition-bar-height: 32px;
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #273548;
    --bg-card: #1a2332;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #334155;
    --border-focus: #60a5fa;
    --accent: #60a5fa;
    --accent-hover: #3b82f6;
    --accent-light: #1e3a5f;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.35);
    --shadow-xl: 0 20px 40px -8px rgba(0, 0, 0, 0.4);
    --error-bg: #3b1a1a;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
    transition: background-color var(--transition), color var(--transition);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}
a:hover {
    color: var(--accent-hover);
}
a:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
    border-radius: 2px;
}

button {
    cursor: pointer;
    font-family: var(--font-body);
    border: none;
    background: none;
    transition: all var(--transition);
}
button:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

.site-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition), border-color var(--transition);
}
.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    gap: 16px;
}
.logo-link {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
    transition: color var(--transition);
}
.logo-icon {
    font-size: 1.5rem;
}
.logo-text {
    letter-spacing: -0.02em;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    border-radius: var(--radius-sm);
    background: transparent;
}
.hamburger-line {
    display: block;
    width: 24px;
    height: 2.5px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}
.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-item {
    position: relative;
}
.nav-item > a,
.dropdown-trigger {
    display: block;
    padding: 10px 14px;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition);
    white-space: nowrap;
}
.nav-item > a:hover,
.dropdown-trigger:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}
.dropdown-trigger {
    display: flex;
    align-items: center;
    gap: 4px;
}
.dropdown-arrow {
    font-size: 0.7rem;
    transition: transform var(--transition);
}
.dropdown.open .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-mega {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 20px 24px;
    display: flex;
    gap: 32px;
    min-width: 520px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    z-index: 999;
}
.dropdown.open .dropdown-mega {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}
.mega-column {
    flex: 1;
    min-width: 0;
}
.mega-title {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: 8px;
    font-weight: 600;
}
.mega-column ul {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.mega-column ul li a {
    display: block;
    padding: 7px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 400;
    transition: all var(--transition);
    white-space: nowrap;
}
.mega-column ul li a:hover {
    background: var(--accent-light);
    color: var(--accent);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background: var(--bg-tertiary);
    flex-shrink: 0;
    transition: all var(--transition);
}
.theme-toggle:hover {
    background: var(--border-color);
}
.theme-icon-light,
.theme-icon-dark {
    transition: var(--transition);
}
[data-theme="dark"] .theme-icon-light {
    display: none;
}
[data-theme="light"] .theme-icon-dark {
    display: none;
}

.breadcrumb {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 12px 20px 0;
}
.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-tertiary);
}
.breadcrumb li {
    display: flex;
    align-items: center;
    gap: 6px;
}
.breadcrumb li:not(:last-child)::after {
    content: '›';
    font-size: 1rem;
    color: var(--text-tertiary);
}
.breadcrumb a {
    color: var(--text-tertiary);
}
.breadcrumb a:hover {
    color: var(--accent);
}
.breadcrumb [aria-current="page"] {
    color: var(--text-primary);
    font-weight: 500;
}

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px 40px;
}

.hero-section {
    padding: 28px 0 12px;
    text-align: center;
}
.hero-container {
    max-width: 800px;
    margin: 0 auto;
}
.hero-section h1 {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.2;
}
.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 24px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.calculator-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 28px 24px;
    box-shadow: var(--shadow-lg);
    text-align: left;
    transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.form-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.form-row .form-group {
    flex: 1;
    min-width: 200px;
}
.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 5px;
    color: var(--text-primary);
    font-family: var(--font-heading);
}
.input-with-unit {
    display: flex;
    gap: 0;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition);
    background: var(--bg-primary);
}
.input-with-unit:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.08);
}
.input-with-unit input {
    flex: 1;
    border: none;
    padding: 10px 14px;
    font-size: 0.95rem;
    font-family: var(--font-body);
    background: transparent;
    color: var(--text-primary);
    min-width: 0;
    outline: none;
}
.input-with-unit select {
    border: none;
    border-left: 1px solid var(--border-color);
    padding: 10px 12px;
    font-size: 0.85rem;
    font-family: var(--font-body);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    min-width: 70px;
    transition: background-color var(--transition);
}
.form-group > select {
    width: 100%;
    padding: 10px 14px;
    font-size: 0.9rem;
    font-family: var(--font-body);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color var(--transition);
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}
.form-group select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.08);
    outline: none;
}
.hint-text {
    display: block;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 4px;
}
.error-msg {
    display: block;
    font-size: 0.75rem;
    color: var(--error);
    margin-top: 4px;
    min-height: 0;
    font-weight: 500;
}
.form-group.has-error .input-with-unit,
.form-group.has-error select {
    border-color: var(--error);
}
.form-group.has-error .input-with-unit {
    background: var(--error-bg);
}

.partitions-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
}
.partition-row {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    flex-wrap: wrap;
    padding: 14px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition);
}
.partition-row .partition-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
    min-width: 90px;
}
.partition-field label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.partition-field input,
.partition-field select {
    padding: 9px 10px;
    font-size: 0.88rem;
    font-family: var(--font-body);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color var(--transition);
    min-width: 0;
}
.partition-field input:focus,
.partition-field select:focus {
    border-color: var(--border-focus);
    outline: none;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.06);
}
.partition-field select {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 28px;
}
.partition-row .remove-partition-btn {
    background: var(--error);
    color: #fff;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    align-self: flex-end;
    transition: all var(--transition);
}
.partition-row .remove-partition-btn:hover {
    background: #dc2626;
    transform: scale(1.08);
}
.partition-row .remove-partition-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none;
}

.form-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 8px;
}
.btn-primary,
.btn-secondary,
.btn-outline {
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all var(--transition);
    font-family: var(--font-heading);
    letter-spacing: 0.01em;
    cursor: pointer;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
    border: 2px solid var(--accent);
}
.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}
.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}
.btn-secondary:hover {
    background: var(--border-color);
}
.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}
.btn-outline:hover {
    background: var(--accent-light);
}
.btn-sm {
    padding: 8px 16px;
    font-size: 0.8rem;
}
.form-feedback {
    margin-top: 12px;
    font-weight: 500;
    font-size: 0.85rem;
    min-height: 20px;
}
.form-feedback.error {
    color: var(--error);
}
.form-feedback.success {
    color: var(--success);
}

.results-section {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
    display: none;
}
.results-section.visible {
    display: block;
    animation: fadeInUp 0.4s ease;
}
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.results-summary {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}
.result-stat {
    flex: 1;
    min-width: 120px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 14px;
    text-align: center;
    border: 1px solid var(--border-color);
}
.result-stat .stat-value {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
}
.result-stat .stat-label {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-top: 2px;
}
.partition-bar-container {
    margin-bottom: 16px;
}
.partition-bar-label {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-secondary);
}
.partition-bar {
    display: flex;
    height: var(--partition-bar-height);
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}
.partition-bar-segment {
    transition: width 0.5s ease, background-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: #fff;
    min-width: 2px;
    overflow: hidden;
    white-space: nowrap;
}
.partition-bar-segment.unallocated {
    background: repeating-linear-gradient(45deg, transparent, transparent 4px, rgba(255, 255, 255, 0.15) 4px, rgba(255, 255, 255, 0.15) 8px);
    color: var(--text-tertiary);
}
.results-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 12px;
}
.results-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}
.results-table th,
.results-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}
.results-table th {
    font-weight: 600;
    color: var(--text-tertiary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: var(--bg-secondary);
}
.results-table td {
    color: var(--text-primary);
}
.results-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.reference-links-section {
    padding: 10px 0 20px;
    text-align: center;
}
.section-title-sm {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}
.ref-links-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}
.ref-link-chip {
    display: inline-block;
    padding: 7px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all var(--transition);
    white-space: nowrap;
}
.ref-link-chip:hover {
    background: var(--accent-light);
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-1px);
}

.features-section,
.how-it-works-section,
.faq-section,
.cta-section,
.content-section {
    padding: 32px 0;
}
.section-title {
    font-family: var(--font-heading);
    font-size: 1.7rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}
.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: all var(--transition);
}
.feature-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.feature-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 10px;
}
.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}
.feature-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.content-text {
    max-width: 780px;
    margin: 0 auto;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.75;
}
.content-text p {
    margin-bottom: 14px;
}
.content-text strong {
    color: var(--text-primary);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}
.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    text-align: center;
    transition: all var(--transition);
}
.step-card:hover {
    box-shadow: var(--shadow-md);
}
.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 10px;
}
.step-card h3 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}
.step-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition);
}
.faq-item summary {
    padding: 16px 18px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--text-primary);
    font-family: var(--font-heading);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.faq-item summary::-webkit-details-marker {
    display: none;
}
.faq-item summary::after {
    content: '+';
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--text-tertiary);
    transition: transform var(--transition);
    flex-shrink: 0;
}
.faq-item[open] summary::after {
    content: '−';
    transform: rotate(180deg);
}
.faq-item p {
    padding: 0 18px 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.cta-section {
    text-align: center;
    background: var(--accent-light);
    border-radius: var(--radius-xl);
    padding: 36px 24px;
    margin-top: 16px;
}
.cta-section p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.95rem;
}
.cta-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.feedback-share-section {
    padding: 20px 0;
    text-align: center;
}
.feedback-share-row {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.site-footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    padding: 32px 20px 20px;
    transition: background-color var(--transition);
}
.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}
.footer-column h4 {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    margin-bottom: 10px;
}
.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.footer-column ul li a {
    font-size: 0.82rem;
    color: var(--text-secondary);
    padding: 3px 0;
    display: inline-block;
    transition: color var(--transition);
}
.footer-column ul li a:hover {
    color: var(--accent);
}
.footer-bottom {
    max-width: var(--max-width);
    margin: 20px auto 0;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 0.78rem;
    color: var(--text-tertiary);
}
.footer-bottom .disclaimer {
    margin-bottom: 10px;
    font-size: 0.72rem;
    color: var(--text-tertiary);
    line-height: 1.5;
}
.footer-bottom .copyright {
    margin-bottom: 4px;
}
.footer-links-bottom a {
    color: var(--text-tertiary);
    font-size: 0.78rem;
}
.footer-links-bottom a:hover {
    color: var(--accent);
}

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-top: 2px solid var(--border-color);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    z-index: 9999;
    box-shadow: var(--shadow-xl);
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: transform 0.3s ease, opacity 0.3s ease;
}
.cookie-banner.hidden {
    transform: translateY(100%);
    opacity: 0;
    pointer-events: none;
}
.cookie-banner p {
    margin: 0;
    flex: 1;
    min-width: 200px;
    text-align: center;
}
.cookie-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}
.log-indicator {
    position: fixed;
    bottom: 8px;
    right: 8px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--success);
    z-index: 9998;
    opacity: 0.6;
    pointer-events: none;
    transition: background 0.5s;
}
.log-indicator.has-errors {
    background: var(--error);
    animation: pulse-error 2s infinite;
}
@keyframes pulse-error {
    0%,
    100% {
        opacity: 0.6;
    }
    50% {
        opacity: 1;
    }
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 1.7rem;
    }
    .hero-subtitle {
        font-size: 0.9rem;
    }
    .calculator-card {
        padding: 18px 14px;
    }
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    .form-row .form-group {
        min-width: 100%;
    }
    .partition-row {
        flex-direction: column;
        gap: 8px;
        padding: 12px;
    }
    .partition-row .partition-field {
        min-width: 100%;
    }
    .partition-row .remove-partition-btn {
        align-self: center;
        margin-top: 4px;
    }
    .results-summary {
        flex-direction: column;
        gap: 8px;
    }
    .nav-toggle {
        display: flex;
    }
    .nav-list {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 16px;
        border-bottom: 2px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        display: none;
        z-index: 998;
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
    }
    .nav-list.open {
        display: flex;
    }
    .nav-item {
        width: 100%;
    }
    .dropdown-mega {
        position: static;
        transform: none;
        min-width: 100%;
        box-shadow: none;
        border: none;
        padding: 8px 0;
        flex-direction: column;
        gap: 8px;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        display: none;
        background: transparent;
    }
    .dropdown.open .dropdown-mega {
        display: flex;
    }
    .section-title {
        font-size: 1.3rem;
    }
    .features-grid,
    .steps-container {
        grid-template-columns: 1fr;
    }
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
    .cookie-banner {
        flex-direction: column;
        text-align: center;
        padding: 12px 16px;
    }
    .ref-links-grid {
        gap: 5px;
    }
    .ref-link-chip {
        font-size: 0.72rem;
        padding: 5px 10px;
    }
}

@media (max-width: 480px) {
    .hero-section h1 {
        font-size: 1.4rem;
    }
    .btn-primary,
    .btn-secondary,
    .btn-outline {
        padding: 10px 16px;
        font-size: 0.8rem;
        width: 100%;
        justify-content: center;
    }
    .form-actions {
        flex-direction: column;
    }
    .results-actions {
        flex-direction: column;
    }
    .footer-container {
        grid-template-columns: 1fr;
    }
    .cta-buttons {
        flex-direction: column;
    }
    .feedback-share-row {
        flex-direction: column;
        align-items: center;
    }
    .partition-bar {
        height: 22px;
    }
    .results-table {
        font-size: 0.72rem;
    }
    .results-table th,
    .results-table td {
        padding: 6px 8px;
    }
}