/* ============================================
   PromptSaaS Engine - Main Stylesheet
   ============================================ */

:root {
    /* Color System */
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-tertiary: #1a1a24;
    --bg-card: #14141e;
    --bg-card-hover: #1c1c2a;
    --bg-input: #111118;

    --border: #2a2a3a;
    --border-light: #222233;
    --border-focus: #6c5ce7;

    --text-primary: #f0f0f5;
    --text-secondary: #9898b0;
    --text-muted: #686880;
    --text-inverse: #0a0a0f;

    --accent: #6c5ce7;
    --accent-hover: #7c6ef7;
    --accent-glow: rgba(108, 92, 231, 0.25);
    --accent-2: #00cec9;
    --accent-3: #fd79a8;

    --success: #00b894;
    --warning: #fdcb6e;
    --danger: #e17055;
    --info: #74b9ff;

    /* Spacing */
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Typography */
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow: 0 4px 16px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 40px var(--accent-glow);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; display: block; }

/* ============================================
   Utility
   ============================================ */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

.gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.4rem;
    border: 1px solid transparent;
    border-radius: var(--radius);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 2px 12px var(--accent-glow);
}
.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 20px var(--accent-glow);
    transform: translateY(-1px);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border);
}
.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(108, 92, 231, 0.06);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 0.65rem 1rem;
}
.btn-ghost:hover { color: var(--text-primary); background: var(--bg-tertiary); }

.btn-danger-ghost {
    background: transparent;
    color: var(--danger);
    border: none;
    padding: 0.65rem 1rem;
}
.btn-danger-ghost:hover { background: rgba(225, 112, 85, 0.1); }

.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.8rem; }
.btn-lg { padding: 0.85rem 2rem; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }

/* ============================================
   Navbar (Home)
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    background: rgba(10, 10, 15, 0.8);
    border-bottom: 1px solid var(--border-light);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
    color: var(--text-primary);
}
.logo-icon {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent);
    background: var(--bg-tertiary);
    padding: 0.3rem 0.5rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}
.logo-text {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-links { display: flex; gap: 0.5rem; align-items: center; }

/* ============================================
   Hero
   ============================================ */
.hero {
    padding: 10rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -40%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}
.hero > .container { position: relative; z-index: 1; }

.hero-badge {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 2rem;
    animation: fadeInDown 0.6s ease;
}

.hero-title {
    font-size: clamp(2.4rem, 5.5vw, 4.2rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.7s ease 0.1s both;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
    animation: fadeInUp 0.7s ease 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 4rem;
    animation: fadeInUp 0.7s ease 0.3s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    animation: fadeInUp 0.7s ease 0.4s both;
}
.stat { text-align: center; }
.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    font-family: var(--font-mono);
}
.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================
   Sections (Home)
   ============================================ */
.features-section, .compat-section, .cta-section {
    padding: 6rem 0;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}
.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3.5rem;
    font-size: 1.05rem;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    transition: all 0.3s;
}
.step-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
    transform: translateY(-4px);
}
.step-number {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    opacity: 0.6;
    margin-bottom: 1rem;
}
.step-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}
.step-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* Compat Grid */
.compat-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}
.compat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.5rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    min-width: 140px;
    transition: all 0.3s;
}
.compat-item:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.compat-icon { color: var(--accent); }
.compat-item span { font-weight: 600; font-size: 0.9rem; }

/* CTA */
.cta-card {
    text-align: center;
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-card));
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 4rem 3rem;
    position: relative;
    overflow: hidden;
}
.cta-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--accent-2), transparent);
}
.cta-card h2 { font-size: 2rem; margin-bottom: 0.75rem; }
.cta-card p { color: var(--text-secondary); margin-bottom: 2rem; font-size: 1.05rem; }

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border-light);
}
.footer-inner { text-align: center; }
.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}
.footer-text { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 0.5rem; }
.footer-copy { color: var(--text-muted); font-size: 0.8rem; }

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: none;
}
.modal-overlay.active { display: block; }

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    width: 420px;
    max-width: 92vw;
    z-index: 201;
    display: none;
    opacity: 0;
    transition: all 0.25s;
}
.modal.active {
    display: block;
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}
.modal-header h2 { font-size: 1.3rem; }
.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.2rem;
    line-height: 1;
}
.modal-close:hover { color: var(--text-primary); }

.modal-switch {
    text-align: center;
    margin-top: 1.25rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.form-message {
    padding: 0.5rem 0;
    font-size: 0.85rem;
    min-height: 2rem;
}
.form-message.error { color: var(--danger); }
.form-message.success { color: var(--success); }

/* ============================================
   Form Elements
   ============================================ */
.form-group { margin-bottom: 1.25rem; }
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: all 0.2s;
    outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-group textarea { resize: vertical; min-height: 80px; }
.form-group select { cursor: pointer; }
.form-group select option { background: var(--bg-secondary); }

.form-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 500;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toast {
    padding: 0.85rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    min-width: 280px;
    max-width: 420px;
    animation: slideInRight 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border: 1px solid;
}
.toast.success { background: rgba(0, 184, 148, 0.15); border-color: var(--success); color: var(--success); }
.toast.error { background: rgba(225, 112, 85, 0.15); border-color: var(--danger); color: var(--danger); }
.toast.info { background: rgba(116, 185, 255, 0.15); border-color: var(--info); color: var(--info); }

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes slideInRight {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .hero { padding: 7rem 0 4rem; }
    .hero-stats { gap: 2rem; }
    .steps-grid { grid-template-columns: 1fr; }
    .compat-grid { gap: 1rem; }
    .compat-item { min-width: 110px; padding: 1rem; }
    .cta-card { padding: 2.5rem 1.5rem; }
    .nav-links .btn-ghost { display: none; }
    .container { padding: 0 1.25rem; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.8rem; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .hero-stats { flex-wrap: wrap; gap: 1.5rem; }
    .modal { padding: 1.5rem; }
}