/* DeepSlide Landing Page Styles - Linear/Vercel Inspired */

:root {
    /* Background layers */
    --bg-base: #0f1117;
    --bg-surface: #161922;
    --bg-elevated: #1c2029;
    --bg-hover: #252a36;
    --bg-active: #2d3340;

    /* Text layers */
    --text-primary: #f0f2f5;
    --text-secondary: #9ca3b4;
    --text-tertiary: #6b7280;
    --text-disabled: #4b5263;
    --text-inverse: #0f1117;

    /* Primary - Indigo Purple */
    --primary-400: #6b8afd;
    --primary-500: #5471e8;
    --primary-600: #4259c9;

    /* Accent - Amber */
    --accent-400: #fbbf24;
    --accent-500: #f59e0b;
    --accent-600: #d97706;

    /* Semantic */
    --success-500: #10b981;
    --error-500: #ef4444;

    /* Border */
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-default: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.16);
    --border-focus: rgba(107, 138, 253, 0.5);

    /* Shadow */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
    --shadow-glow: 0 0 20px rgba(107, 138, 253, 0.15);

    /* Gradients */
    --gradient-brand: linear-gradient(135deg, #6b8afd 0%, #a78bfa 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
}

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

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Animated Background */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(900px circle at 15% -10%, rgba(107, 138, 253, 0.15), transparent 55%),
        radial-gradient(900px circle at 85% 0%, rgba(167, 139, 250, 0.10), transparent 50%),
        radial-gradient(1200px circle at 50% 120%, rgba(15, 17, 23, 0.9), transparent 55%);
    z-index: -1;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 17, 23, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-subtle);
    z-index: 100;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.nav-logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-brand);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.nav-logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    background: linear-gradient(120deg, #ffffff 10%, #d9e5ff 50%, #a78bfa 95%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 0.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    outline: none;
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.btn-primary {
    background: var(--gradient-brand);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    filter: brightness(1.05);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-secondary:hover {
    background: var(--bg-hover);
}

.btn-accent {
    background: var(--gradient-accent);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

.btn-accent:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    filter: brightness(1.05);
}

.btn-large {
    padding: 0.875rem 2rem;
    font-size: 1rem;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: 999px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 2rem;
}

.hero-badge-dot {
    width: 6px;
    height: 6px;
    background: var(--success-500);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    max-width: 900px;
}

.hero-title-gradient {
    background: linear-gradient(120deg, #ffffff 20%, #6b8afd 50%, #a78bfa 80%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 3rem;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* Features Section */
.features {
    padding: 6rem 2rem;
    background: var(--bg-surface);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
}

.features-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    padding: 2rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-default);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-brand);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* How It Works */
.how-it-works {
    padding: 6rem 2rem;
}

.how-it-works-container {
    max-width: 1000px;
    margin: 0 auto;
}

.how-it-works-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 4rem;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--gradient-brand);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-inverse);
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.step-content p {
    color: var(--text-secondary);
}

/* Footer */
.footer {
    padding: 3rem 2rem;
    border-top: 1px solid var(--border-subtle);
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* Auth Forms */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-default);
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.auth-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.auth-logo-icon {
    width: 56px;
    height: 56px;
    background: var(--gradient-brand);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
}

.auth-logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(120deg, #ffffff 10%, #d9e5ff 50%, #a78bfa 95%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.auth-title {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: 10px;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--border-focus);
}

.form-input::placeholder {
    color: var(--text-disabled);
}

.form-error {
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 10px;
    color: var(--error-500);
    font-size: 0.875rem;
}

.form-submit {
    width: 100%;
    margin-top: 0.5rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-footer a {
    color: var(--primary-400);
    text-decoration: none;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        padding: 0.75rem 1rem;
    }

    .nav-logo-text {
        display: none;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .step {
        flex-direction: column;
        text-align: center;
        align-items: center;
    }
}

/* Auth Divider */
.auth-divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.auth-divider span {
    padding: 0 1rem;
}

/* Google Button */
.btn-google {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    background: #ffffff;
    color: #1f2937;
    border: 1px solid #e5e7eb;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-google:hover {
    background: #f9fafb;
    border-color: #d1d5db;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.google-icon {
    flex-shrink: 0;
}