/* Modern CSS Reset and Variables */
:root {
    --color-primary: #e85d40;
    --color-primary-dark: #c94d33;
    --color-bg: #0f172a;
    --color-bg-light: #1e293b;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-inverse: #ffffff;
    --color-border: #e2e8f0;
    --color-error: #ef4444;
    --color-success: #22c55e;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    --transition: 150ms ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
    min-height: 100vh;
    color: var(--color-text);
    line-height: 1.6;
}

/* App Container */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header__title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-inverse);
    margin-bottom: 0.5rem;
}

.header__title a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

.header__title a:hover {
    color: var(--color-primary);
}

.header__nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.header__link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all var(--transition);
}

.header__link:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

/* Search Form */
.search-container {
    max-width: 600px;
    margin: 0 auto 2rem;
}

.search-form {
    display: flex;
    gap: 0.5rem;
    background: var(--color-surface);
    padding: 0.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.search-form input[type="text"] {
    flex: 1;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: var(--font-mono);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    background: var(--color-bg-light);
    color: var(--color-text-inverse);
    outline: none;
    transition: all var(--transition);
}

.search-form input[type="text"]:focus {
    border-color: var(--color-primary);
    background: var(--color-bg);
}

.search-form input[type="text"]::placeholder {
    color: var(--color-text-light);
}

.search-form button,
.search-form input[type="submit"] {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-inverse);
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

.search-form button:hover,
.search-form input[type="submit"]:hover {
    background: var(--color-primary-dark);
}

/* Result Cards */
.results {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-card--error {
    border-left: 4px solid var(--color-error);
}

.result-card__header {
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, var(--color-bg-light), var(--color-bg));
    border-bottom: 1px solid var(--color-border);
}

.result-card__title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-inverse);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.result-card__body {
    padding: 1.25rem;
}

.result-card__input {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-light);
    padding: 0.75rem;
    background: #f8fafc;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    overflow-x: auto;
}

.result-card__output {
    font-size: 1.125rem;
    text-align: center;
    overflow-x: auto;
    padding: 0.5rem 0;
}

/* Steps List */
.steps {
    list-style: none;
    counter-reset: step;
    margin: 1rem 0;
    padding: 0;
}

.steps--nested {
    margin-left: 2rem;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}

/* Individual Step */
.step {
    position: relative;
    padding: 1rem 2.5rem 1rem 3rem;
    border-left: 2px solid var(--color-border);
    margin-left: 1.25rem;
    margin-bottom: 0.75rem;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.step:hover {
    box-shadow: var(--shadow-md);
    border-left-color: var(--color-primary);
}

/* Step Number Badge */
.step::before {
    counter-increment: step;
    content: attr(data-step);
    position: absolute;
    left: -1rem;
    top: 1rem;
    width: 2rem;
    height: 2rem;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    z-index: 1;
    box-shadow: 0 2px 6px rgba(232, 93, 64, 0.35);
}

.step:hover::before {
    background: var(--color-primary-dark);
    transform: scale(1.1);
    box-shadow: 0 4px 10px rgba(232, 93, 64, 0.4);
}

/* Step Text - always visible */
.step__text {
    margin: 0.25rem 0;
    line-height: 1.7;
    color: var(--color-text);
}

/* Step Math - collapsible */
.step__math {
    transition: all var(--transition);
    background: #f8fafc;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    margin: 0.75rem 0;
    border-left: 3px solid var(--color-primary);
    overflow-x: auto;
}

/* Step Content wrapper */
.step__content {
    transition: all var(--transition);
}

.step__content p {
    margin: 0.25rem 0;
    line-height: 1.6;
}

/* Collapsible Step Behavior - hide math and nested steps when collapsed */
.step.collapsible:not(.open) .step__math,
.step.collapsible:not(.open) > .step__content,
.step.collapsible:not(.open) > .steps--nested {
    display: none !important;
    visibility: hidden !important;
    height: 0 !important;
    overflow: hidden !important;
}

/* Ensure inline math spans are also hidden */
.step.collapsible:not(.open) span.step__math {
    display: none !important;
}

.step.collapsible.open .step__math,
.step.collapsible.open > .step__content,
.step.collapsible.open > .steps--nested {
    display: block;
    visibility: visible;
    height: auto;
    overflow: visible;
}

/* Inline math stays inline when visible */
span.step__math {
    display: inline;
    background: transparent;
    padding: 0.125rem 0.25rem;
    border-radius: 3px;
    border-left: none;
    margin: 0;
}

.step.collapsible.open span.step__math {
    display: inline !important;
    visibility: visible !important;
    height: auto !important;
    background: rgba(232, 93, 64, 0.1);
    border-radius: 3px;
}

.step.collapsible.open div.step__math {
    display: block !important;
    visibility: visible !important;
    height: auto !important;
}

/* Expand/Collapse Icon */
.step.collapsible::after {
    content: '';
    position: absolute;
    right: 1rem;
    top: 1rem;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 6px solid var(--color-primary);
    transition: transform var(--transition);
}

.step.collapsible:not(.open)::after {
    transform: rotate(-90deg);
}

.step.collapsible.open::after {
    transform: rotate(0deg);
}

/* Steps Controls */
.steps-controls {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 1.5rem;
    gap: 0.75rem;
}

.btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}

.btn--secondary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn--secondary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Step Details (for method alternatives) */
.step__details {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: #f8fafc;
    border-radius: var(--radius-sm);
}

/* Examples Grid */
.examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.example-group {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.example-group h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-primary);
}

.example-group h4 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-light);
    margin: 1rem 0 0.5rem;
}

.example-group ul {
    list-style: none;
}

.example-group li {
    margin-bottom: 0.5rem;
}

.example-group a {
    display: block;
    padding: 0.5rem 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.example-group a:hover {
    background: var(--color-bg-light);
    color: var(--color-text-inverse);
}

/* Content Layout - Sidebar + Results */
.content-layout {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    position: relative;
}

.results-panel {
    flex: 1;
    min-width: 0;
    transition: margin-right var(--transition);
}

.content-layout.chat-open .results-panel {
    margin-right: 0;
}

/* Chat Sidebar */
.chat-sidebar {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: 380px;
    max-width: 90vw;
    background: var(--color-surface);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transform: translateX(100%);
    transition: transform 0.3s ease;
}

.chat-sidebar.open {
    transform: translateX(0);
}

.chat-sidebar__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, var(--color-bg-light), var(--color-bg));
    border-bottom: 1px solid var(--color-border);
    min-height: 60px;
}

.chat-sidebar__title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chat-sidebar__badge {
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.125rem 0.375rem;
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    color: white;
    border-radius: var(--radius-sm);
}

.chat-sidebar__toggle {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    flex-shrink: 0;
}

.chat-sidebar__toggle:hover {
    background: var(--color-primary-dark);
    transform: scale(1.05);
}

.chat-sidebar__toggle .toggle-icon {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--color-text-inverse);
    transition: transform 0.3s ease;
    line-height: 1;
}

.chat-sidebar.open .chat-sidebar__toggle .toggle-icon {
    transform: rotate(180deg);
}

.chat-sidebar__body {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Chat Modal - Keep for mobile fallback */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease;
}

.modal.open {
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal__content {
    width: 100%;
    max-width: 500px;
    max-height: 80vh;
    margin: 1rem;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.modal__title {
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal__badge {
    font-size: 0.625rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.125rem 0.375rem;
    background: linear-gradient(135deg, #8b5cf6, #6366f1);
    color: white;
    border-radius: var(--radius-sm);
}

.modal__close {
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-light);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.modal__close:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.chat-log {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.chat-message {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-lg);
    max-width: 85%;
    animation: fadeIn 0.2s ease;
    line-height: 1.6;
}

.chat-message--user {
    align-self: flex-end;
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.chat-message--bot {
    align-self: flex-start;
    background: #f1f5f9;
    color: var(--color-text);
}

.chat-message--bot strong {
    color: var(--color-primary);
    font-weight: 600;
}

.chat-message--bot code {
    background: #e2e8f0;
    padding: 0.125rem 0.375rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.85em;
}

.chat-message--bot em {
    font-style: italic;
}

.chat-message--typing {
    background: #f1f5f9;
    color: var(--color-text-light);
}

.typing-dots {
    display: inline-flex;
    gap: 0.2rem;
}

.typing-dots span {
    animation: typingBounce 1.4s infinite ease-in-out;
    font-size: 1.5rem;
    line-height: 0.5;
}

.typing-dots span:nth-child(1) { animation-delay: 0s; }
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-0.25rem); }
}

.chat-input {
    display: flex;
    gap: 0.5rem;
    padding: 1rem;
    border-top: 1px solid var(--color-border);
}

.chat-input input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    outline: none;
    transition: border-color var(--transition);
}

.chat-input input:focus {
    border-color: var(--color-primary);
}

.chat-input button {
    padding: 0.75rem 1rem;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition);
}

.chat-input button:hover {
    background: var(--color-primary-dark);
}

/* Footer */
.footer {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer__section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text);
    margin-bottom: 1rem;
}

.footer__section p {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

.footer__links {
    list-style: none;
}

.footer__links li {
    margin-bottom: 0.5rem;
}

.footer__links a {
    font-size: 0.875rem;
    color: var(--color-text-light);
    text-decoration: none;
    transition: color var(--transition);
}

.footer__links a:hover {
    color: var(--color-primary);
}

/* Loader */
.loader {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 1rem auto;
}

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

/* Utility Classes */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-mono { font-family: var(--font-mono); }

/* Button */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
}

.btn--primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn--primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

/* Error Pages */
.error-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.error-page__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.error-page__title {
    font-size: 6rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 1rem;
}

.error-page__message {
    font-size: 1.25rem;
    color: var(--color-text-inverse);
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Reference Page */
.reference {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.reference__title {
    color: var(--color-text-inverse);
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: 2rem;
}

.search-container--compact {
    max-width: 400px;
    margin: 0 auto 2rem;
}

.search-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.reference__grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.reference__card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
}

.reference__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.reference__card h3 {
    padding: 1rem;
    font-size: 1rem;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

.reference__card img {
    width: 100%;
    height: auto;
    display: block;
}

/* Result Cards */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.card--suggestion {
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: 1rem;
}

.card--error {
    border-left: 4px solid var(--color-error);
}

.card__header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    background: #f8fafc;
}

.card__title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
}

.card__title a {
    color: inherit;
    text-decoration: none;
}

.card__title a:hover {
    color: var(--color-primary);
}

.card__input,
.card__output {
    padding: 1rem 1.5rem;
}

.card__input {
    background: #f1f5f9;
    border-bottom: 1px solid var(--color-border);
}

.card__input pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    white-space: pre-wrap;
    word-break: break-word;
}

.card__output {
    font-size: 1rem;
    line-height: 1.8;
}

.card__pre-output {
    margin-right: 0.5rem;
}

.card__output--dynamic {
    min-height: 60px;
}

.card__error {
    padding: 1rem 1.5rem;
    background: #fef2f2;
}

.card__error-context {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.card__error-message {
    color: var(--color-error);
    font-weight: 500;
}

/* Loader Animation */
.loader {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Results Container */
.results {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header__title {
        font-size: 1.75rem;
    }
    
    .search-form {
        flex-direction: column;
    }
    
    .examples {
        grid-template-columns: 1fr;
    }
    
    .error-page__title {
        font-size: 4rem;
    }
    
    .reference__grid {
        grid-template-columns: 1fr;
    }
    
    /* Chat sidebar becomes full overlay on mobile */
    .chat-sidebar {
        width: 100%;
        max-width: 100%;
        transform: translateX(100%);
    }
    
    .chat-sidebar.open {
        transform: translateX(0);
    }
    
    .chat-sidebar__header {
        padding: 0.75rem 1rem;
    }
    
    .chat-sidebar.open .chat-sidebar__title {
        opacity: 1;
    }
}

/* Legacy support for math/tex scripts */
script[type="math/tex"] {
    display: none;
}

/* ==========================================
   NEW HOMEPAGE STYLES
   ========================================== */

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 1rem 3rem;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-light) 100%);
}

.hero__content {
    max-width: 700px;
    margin: 0 auto;
}

.hero__icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-md);
}

.hero__title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--color-text-inverse);
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.hero__subtitle {
    font-size: 1.5rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 1rem;
}

.hero__description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero__search {
    max-width: 500px;
    margin: 0 auto;
}

.search-form--hero {
    box-shadow: var(--shadow-lg), 0 0 40px rgba(232, 93, 64, 0.15);
}

/* Section Title */
.section__title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-inverse);
    text-align: center;
    margin-bottom: 2rem;
}

/* Quick Examples */
.quick-examples {
    padding: 3rem 1rem;
    background: var(--color-bg-light);
}

.quick-examples__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.quick-example {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition), box-shadow var(--transition);
}

.quick-example:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.quick-example h3 {
    font-size: 1.25rem;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
}

.quick-example p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.quick-example__link {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: var(--color-bg);
    color: var(--color-text-inverse);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 1.1rem;
    transition: background var(--transition);
}

.quick-example__link:hover {
    background: var(--color-primary);
}

/* Features */
.features {
    padding: 3rem 1rem;
    background: var(--color-bg);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.feature {
    text-align: center;
    padding: 1.5rem;
}

.feature__icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature h3 {
    color: var(--color-text-inverse);
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.feature p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

.feature code {
    background: var(--color-bg-light);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-primary);
}

/* More Examples with Tabs */
.more-examples {
    padding: 3rem 1rem;
    background: var(--color-bg-light);
}

.examples-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tab {
    padding: 0.75rem 1.5rem;
    background: var(--color-bg);
    color: var(--color-text-light);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.tab:hover {
    background: var(--color-primary-dark);
    color: var(--color-text-inverse);
}

.tab.active {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.examples-content {
    max-width: 700px;
    margin: 0 auto;
}

.examples-panel {
    display: none;
}

.examples-panel.active {
    display: block;
}

.examples-list {
    list-style: none;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.examples-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
}

.examples-list li:last-child {
    border-bottom: none;
}

.examples-list a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}

.examples-list a:hover {
    text-decoration: underline;
}

/* CTA Section */
.cta {
    padding: 4rem 1rem;
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

.cta h2 {
    color: var(--color-text-inverse);
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.cta p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

.cta__button {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--color-text-inverse);
    color: var(--color-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition);
}

.cta__button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* Footer */
.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 1rem 2rem;
}

.footer__section--about {
    grid-column: span 1;
}

@media (min-width: 768px) {
    .footer__section--about {
        grid-column: span 2;
    }
}

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

.footer__icon {
    vertical-align: middle;
    margin-right: 0.375rem;
}

.footer__bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 1rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer__bottom p {
    font-size: 0.875rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

.footer__bottom a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

.footer__bottom a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* ==========================================
   REFERENCE PAGE STYLES
   ========================================== */

.reference-guide {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.reference-guide__title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-text-inverse);
    text-align: center;
    margin-bottom: 0.75rem;
}

.reference-guide__intro {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

/* Reference Navigation */
.reference-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
    padding: 1rem;
    background: var(--color-bg-light);
    border-radius: var(--radius-lg);
}

.reference-nav__link {
    padding: 0.75rem 1.5rem;
    color: var(--color-text-inverse);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition);
}

.reference-nav__link:hover {
    background: var(--color-primary);
}

/* Formula Sections */
.formula-section {
    margin-bottom: 4rem;
    scroll-margin-top: 2rem;
}

.formula-section__title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-inverse);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--color-primary);
}

.formula-section__description {
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

/* Formula Groups */
.formula-group {
    margin-bottom: 2rem;
}

.formula-group h3 {
    color: var(--color-text-inverse);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

/* Formula Grid */
.formula-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

/* Formula Card */
.formula-card {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.formula-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.formula-card--wide {
    grid-column: 1 / -1;
}

.formula-card__formula {
    font-size: 1.1rem;
    color: var(--color-text);
    text-align: center;
    padding: 0.5rem 0;
}

.formula-card__name {
    font-size: 0.8rem;
    color: var(--color-text-light);
    text-align: center;
}

.formula-card__try {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
    text-align: center;
    margin-top: auto;
    transition: background var(--transition);
}

.formula-card__try:hover {
    background: var(--color-primary-dark);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 48px;
    height: 48px;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-family: inherit;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
}

/* Responsive for new pages */
@media (max-width: 768px) {
    .hero__title {
        font-size: 2.5rem;
    }
    
    .hero__subtitle {
        font-size: 1.25rem;
    }
    
    .quick-examples__grid {
        grid-template-columns: 1fr;
    }
    
    .examples-tabs {
        flex-wrap: wrap;
    }
    
    .tab {
        flex: 1;
        min-width: 100px;
    }
    
    .formula-grid {
        grid-template-columns: 1fr;
    }
    
    .reference-nav {
        flex-direction: column;
        align-items: stretch;
    }
    
    .reference-nav__link {
        text-align: center;
    }
}