/* ==========================================================================
   Hyfel Multi-Page Application - Modular CSS Architecture
   ========================================================================== */

/* Design Tokens & Theme Variables */
:root[data-theme="dark"] {
    --bg-main: #090d16;
    --bg-surface: rgba(18, 26, 44, 0.7);
    --bg-surface-hover: rgba(28, 39, 64, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(99, 102, 241, 0.35);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-glow: rgba(99, 102, 241, 0.25);
    --accent: #10b981;
    --accent-glow: rgba(16, 185, 129, 0.2);
    --card-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.6);
    --nav-bg: rgba(9, 13, 22, 0.85);
    --code-bg: rgba(5, 8, 15, 0.7);
}

:root[data-theme="light"] {
    --bg-main: #f8fafc;
    --bg-surface: rgba(255, 255, 255, 0.85);
    --bg-surface-hover: rgba(241, 245, 249, 1);
    --border-color: rgba(0, 0, 0, 0.08);
    --border-highlight: rgba(99, 102, 241, 0.4);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-glow: rgba(79, 70, 229, 0.15);
    --accent: #059669;
    --accent-glow: rgba(5, 150, 105, 0.15);
    --card-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.08);
    --nav-bg: rgba(248, 250, 252, 0.85);
    --code-bg: rgba(241, 245, 249, 0.9);
}

/* Reset & Selection */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
}

::selection {
    background-color: var(--primary);
    color: #ffffff !important;
}

::-moz-selection {
    background-color: var(--primary);
    color: #ffffff !important;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

main { flex: 1; }

.background-glow {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at 50% 10%, var(--primary-glow) 0%, transparent 65%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 1.5rem;
    position: relative;
    z-index: 1;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.nav-container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.35rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-light);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px; left: 0; right: 0;
    height: 2px;
    background-color: var(--primary-light);
    border-radius: 2px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Dropdown Pickers (Language & 3-State Theme) */
.dropdown-picker {
    position: relative;
}

.picker-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
}

.picker-btn:hover {
    border-color: var(--border-highlight);
}

.picker-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--bg-surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 6px;
    min-width: 170px;
    max-height: 320px;
    overflow-y: auto;
    box-shadow: var(--card-shadow);
    display: none;
    flex-direction: column;
    gap: 2px;
    z-index: 1100;
}

.picker-menu.show {
    display: flex;
}

.picker-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
}

.picker-item:hover, .picker-item.active {
    background: var(--primary-glow);
    color: var(--primary-light);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    width: 22px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: 0.3s;
}

/* Page Headers & Hero */
.page-header {
    padding: 9rem 0 4rem 0;
    text-align: center;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 9999px;
    background: var(--accent-glow);
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent);
    box-shadow: 0 0 10px var(--accent);
}

.page-title {
    font-size: 3.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 1.25rem;
    background: linear-gradient(135deg, var(--text-primary) 30%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.page-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto;
    font-weight: 400;
}

.btn-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    font-size: 1rem;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #ffffff;
    box-shadow: 0 10px 25px -5px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px var(--primary-glow);
}

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

.btn-secondary:hover {
    border-color: var(--border-highlight);
    transform: translateY(-2px);
}

/* Sections & Cards Layout */
.section { padding: 4rem 0; }

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 3.5rem;
}

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

.card {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.25rem;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-4px);
    border-color: var(--border-highlight);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 1.25rem;
}

.card-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Pricing Section */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.pricing-card { position: relative; }

.pricing-card.popular {
    border-color: var(--primary-light);
    box-shadow: 0 0 30px var(--primary-glow);
}

.popular-badge {
    position: absolute;
    top: -14px; right: 24px;
    background: var(--primary);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.price-tag {
    font-size: 3rem;
    font-weight: 800;
    margin: 1.5rem 0;
    color: var(--text-primary);
}

.price-period {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.feature-list {
    list-style: none;
    margin: 1.5rem 0 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.check-icon {
    color: var(--accent);
    font-weight: 700;
}

/* Contact & Forms */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-input, .form-textarea {
    width: 100%;
    padding: 12px 16px;
    border-radius: 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
}

.form-input:focus, .form-textarea:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* FAQ Accordion */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
}

.faq-question {
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-answer {
    padding: 0 1.5rem 1.25rem 1.5rem;
    color: var(--text-secondary);
    display: none;
    font-size: 0.95rem;
}

.faq-item.active .faq-answer { display: block; }

/* Specs Box */
.specs-box {
    max-width: 720px;
    margin: 0 auto;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.specs-header {
    background: var(--code-bg);
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.terminal-dots { display: flex; gap: 6px; }
.terminal-dots span { width: 10px; height: 10px; border-radius: 50%; }
.terminal-dots span:nth-child(1) { background-color: #ef4444; }
.terminal-dots span:nth-child(2) { background-color: #f59e0b; }
.terminal-dots span:nth-child(3) { background-color: #10b981; }

.specs-body {
    padding: 2rem;
    font-family: 'JetBrains Mono', monospace;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
}

.spec-label { color: var(--text-secondary); }
.spec-value { color: var(--text-primary); font-weight: 600; }
.spec-value.highlight { color: var(--primary-light); }

/* Footer */
.footer {
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: auto;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .page-title { font-size: 2.35rem; }
    .page-subtitle { font-size: 1.05rem; }
    .mobile-toggle { display: flex; }
    
    .nav-menu {
        position: fixed;
        top: 65px; left: 0; right: 0;
        background: var(--nav-bg);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        display: none;
    }

    .nav-menu.show { display: flex; }
    .contact-container { grid-template-columns: 1fr; }
    .footer-content { flex-direction: column; gap: 1rem; text-align: center; }
    .spec-item { flex-direction: column; align-items: flex-start; gap: 4px; }
}