/* DeepEx Landing Page Styles */

/* ========== CSS Reset & Base ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-gray-50: #FAFAFA;
    --color-gray-100: #F5F5F5;
    --color-gray-200: #E5E5E5;
    --color-gray-300: #D4D4D4;
    --color-gray-400: #A3A3A3;
    --color-gray-500: #737373;
    --color-gray-600: #525252;
    --color-gray-700: #404040;
    --color-gray-800: #262626;
    --color-gray-900: #171717;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

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

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ========== Custom Selection Colors ========== */
/* Default selection: black background with white text */
::selection {
    background-color: var(--color-black);
    color: var(--color-white);
}

::-moz-selection {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* Inverted selection for dark sections: white background with black text */
.modes-section ::selection,
.footer ::selection,
.pipeline-card.ultra-deep ::selection,
.decision-gate ::selection,
.principle ::selection,
.diagram-output ::selection {
    background-color: var(--color-white);
    color: var(--color-black);
}

.modes-section ::-moz-selection,
.footer ::-moz-selection,
.pipeline-card.ultra-deep ::-moz-selection,
.decision-gate ::-moz-selection,
.principle ::-moz-selection,
.diagram-output ::-moz-selection {
    background-color: var(--color-white);
    color: var(--color-black);
}

body {
    font-family: var(--font-family);
    background-color: var(--color-white);
    color: var(--color-black);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========== Header ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--color-black);
    font-weight: 500;
    transition: opacity var(--transition-base);
}

.logo-link:hover {
    opacity: 0.7;
}

.logo-icon {
    width: 20px;
    height: 20px;
}

.logo-text {
    font-size: 0.95rem;
    letter-spacing: -0.01em;
}

.nav-link {
    color: var(--color-gray-600);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-base);
}

.nav-link:hover {
    color: var(--color-black);
}

/* ========== Hero Section ========== */
.hero {
    padding: 8rem var(--spacing-lg) 6rem;
    text-align: center;
    background:
        radial-gradient(circle at 2px 2px, var(--color-gray-200) 1px, transparent 1px);
    background-size: 40px 40px;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg,
            rgba(255, 255, 255, 0) 0%,
            rgba(255, 255, 255, 0.8) 50%,
            rgba(255, 255, 255, 1) 100%);
    pointer-events: none;
}

.hero>.container {
    position: relative;
    z-index: 1;
}

.hero-label {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.hero-label-secondary {
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-gray-400);
    margin-bottom: var(--spacing-2xl);
    font-weight: 400;
}

.hero-logo {
    margin: var(--spacing-2xl) 0;
}

.deepex-logo-svg {
    width: 140px;
    height: auto;
    display: block;
    margin: 0 auto var(--spacing-md);
    color: var(--color-black);
}

.deepex-name {
    font-size: 5rem;
    font-weight: 300;
    line-height: 1;
    letter-spacing: -0.04em;
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 400;
    line-height: 1.3;
    margin: var(--spacing-xl) 0 var(--spacing-md);
    letter-spacing: -0.02em;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--color-gray-600);
    line-height: 1.7;
    margin-bottom: var(--spacing-3xl);
    font-weight: 400;
}

/* ========== Waitlist Section ========== */
.waitlist-container {
    max-width: 500px;
    margin: var(--spacing-3xl) auto 0;
    padding: var(--spacing-xl);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: 2px;
}

.waitlist-header h2 {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
}

.waitlist-header p {
    font-size: 0.95rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.promo-banner {
    background: var(--color-gray-50);
    border: 1px dashed var(--color-gray-300);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.promo-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 2px 8px;
    background: var(--color-black);
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.promo-text {
    font-size: 0.9rem !important;
    /* Override generic p style */
    color: var(--color-black) !important;
    margin-bottom: var(--spacing-xs) !important;
}

.slots-counter {
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--color-gray-600);
}

#slotsRemaining {
    font-weight: 700;
    color: var(--color-black);
}

.waitlist-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group input {
    padding: var(--spacing-md);
    font-size: 1rem;
    font-family: var(--font-family);
    border: 1px solid var(--color-gray-300);
    background: var(--color-white);
    color: var(--color-black);
    transition: all var(--transition-base);
    outline: none;
}

.form-group input:focus {
    border-color: var(--color-black);
    box-shadow: 0 0 0 1px var(--color-black);
}

.form-group input::placeholder {
    color: var(--color-gray-400);
}

.submit-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-black);
    color: var(--color-white);
    border: none;
    font-size: 1rem;
    font-weight: 500;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.submit-btn:hover {
    background-color: var(--color-gray-800);
    transform: translateY(-1px);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    background-color: var(--color-gray-300);
    cursor: not-allowed;
    transform: none;
}

.btn-arrow {
    transition: transform var(--transition-base);
}

.submit-btn:hover .btn-arrow {
    transform: translateX(3px);
}

.form-message {
    padding: var(--spacing-md);
    text-align: center;
    font-size: 0.9rem;
    border-radius: 2px;
    display: none;
}

.form-message.success {
    display: block;
    background-color: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.form-message.error {
    display: block;
    background-color: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* ========== Framework Section ========== */
.framework-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    background-color: var(--color-white);
}

.section-label {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.section-description {
    font-size: 1.05rem;
    color: var(--color-gray-600);
    line-height: 1.7;
    margin-bottom: var(--spacing-2xl);
}

.reasoning-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-2xl);
    border: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
    margin-top: var(--spacing-xl);
}

.diagram-element {
    padding: var(--spacing-md) var(--spacing-xl);
    border: 1px solid var(--color-black);
    background: var(--color-white);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.1em;
}

.diagram-branches {
    display: flex;
    gap: var(--spacing-md);
}

.branch {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-gray-400);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
}

.diagram-output {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-black);
    color: var(--color-white);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.1em;
}

.diagram-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-gray-500);
    margin-top: var(--spacing-sm);
}

/* ========== Modes Section ========== */
.modes-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background: var(--color-black);
    color: var(--color-white);
}

.modes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.mode-card {
    padding: var(--spacing-xl);
    border: 1px solid var(--color-gray-700);
    background: rgba(255, 255, 255, 0.03);
}

.mode-title {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.mode-description {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--color-gray-300);
}

/* ========== Architecture Section ========== */
.architecture-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background: var(--color-white);
    text-align: center;
}

.pipeline-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.pipeline-card {
    padding: var(--spacing-xl);
    border: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
    text-align: left;
}

.pipeline-card.ultra-deep {
    background: var(--color-gray-900);
    color: var(--color-white);
    border-color: var(--color-gray-700);
}

.pipeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-300);
}

.pipeline-card.ultra-deep .pipeline-header {
    border-bottom-color: var(--color-gray-700);
}

.pipeline-mode {
    font-size: 1.1rem;
    font-weight: 500;
}

.pipeline-latency {
    font-size: 0.75rem;
    color: var(--color-gray-500);
    letter-spacing: 0.05em;
}

.pipeline-card.ultra-deep .pipeline-latency {
    color: var(--color-gray-400);
}

.pipeline-layers {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.layer {
    padding: var(--spacing-sm);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    font-size: 0.85rem;
    font-weight: 500;
}

.pipeline-card.ultra-deep .layer {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-gray-700);
    color: var(--color-white);
}

.layer.parallel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
}

.layer.parallel span {
    font-size: 0.8rem;
}

.decision-gate {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-black);
    color: var(--color-white);
    font-size: 0.8rem;
    font-weight: 500;
    text-align: center;
}

/* ========== Parameters Section ========== */
.parameters-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background: var(--color-gray-50);
    text-align: center;
}

.parameters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-2xl) 0;
}

.param-item {
    padding: var(--spacing-lg);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
}

.param-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-sm);
}

.param-value {
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--color-black);
}

.principles-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

.principle {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-black);
    color: var(--color-white);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* ========== Footer ========== */
.footer {
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-xl);
    background: var(--color-black);
    color: var(--color-white);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-logo {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--color-gray-400);
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.footer-column a,
.footer-column p {
    display: block;
    font-size: 0.9rem;
    color: var(--color-gray-400);
    text-decoration: none;
    margin-bottom: var(--spacing-xs);
    transition: color var(--transition-base);
}

.footer-column a:hover {
    color: var(--color-white);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-800);
    text-align: center;
}

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

/* ========== Responsive Design ========== */
@media (max-width: 768px) {
    .hero {
        padding: 6rem var(--spacing-md) 4rem;
    }

    .deepex-logo {
        font-size: 4rem;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .waitlist-container {
        padding: var(--spacing-lg);
    }

    .modes-grid,
    .pipeline-grid,
    .parameters-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .diagram-branches {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .deepex-logo {
        font-size: 3rem;
    }

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

    .waitlist-container {
        padding: var(--spacing-md);
    }

    .submit-btn {
        padding: var(--spacing-md);
    }
}

/* ========== Animations ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-logo,
.hero-title,
.hero-description,
.waitlist-container {
    animation: fadeInUp 0.6s ease-out backwards;
}

.hero-logo {
    animation-delay: 0.1s;
}

.hero-title {
    animation-delay: 0.2s;
}

.hero-description {
    animation-delay: 0.3s;
}

.waitlist-container {
    animation-delay: 0.4s;
}