/* ============================================
   Aero-Sovereign Strategy & Global Transformation Advisory
   Global Design System & Component Styles
   ============================================ */

:root {
    /* Core Color System */
    --color-obsidian: #020408;           /* 曜石深腦黑 - Main background */
    --color-matrix-white: #F8FAFC;       /* 戰略矩陣白 - Primary accent */
    --color-decision-gold: #E2B755;      /* 決策溢價金 - Secondary accent */
    --color-transform-blue: #00A3FF;     /* 變革演進藍 - Tertiary accent */
    
    /* Extended Palette */
    --color-dark-gray: #1A1F2E;
    --color-medium-gray: #2D3748;
    --color-light-gray: #E2E8F0;
    --color-border: #3D4556;
    
    /* Typography */
    --font-display: 'Playfair Display', 'Georgia', serif;
    --font-body: 'Inter', 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* Spacing Scale */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
    --spacing-4xl: 4rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 20px rgba(226, 183, 85, 0.2);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* ============================================
   Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-obsidian);
    color: var(--color-matrix-white);
    line-height: 1.6;
    font-size: 16px;
    letter-spacing: 0.3px;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.2;
}

h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-2xl);
}

h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xl);
}

h3 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
}

h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

h5 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

p {
    margin-bottom: var(--spacing-md);
    color: rgba(248, 250, 252, 0.85);
    font-size: 1rem;
}

.lead {
    font-size: 1.25rem;
    font-weight: 300;
    color: rgba(248, 250, 252, 0.8);
}

.text-gold {
    color: var(--color-decision-gold);
}

.text-blue {
    color: var(--color-transform-blue);
}

.text-muted {
    color: rgba(248, 250, 252, 0.6);
}

/* ============================================
   Navigation Bar
   ============================================ */

.navbar {
    background-color: var(--color-obsidian);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(2, 4, 8, 0.95);
}

.navbar-brand {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-decision-gold) !important;
    letter-spacing: 0.5px;
    transition: all var(--transition-base);
}

.navbar-brand:hover {
    color: var(--color-transform-blue) !important;
    text-shadow: 0 0 10px rgba(0, 163, 255, 0.3);
}

.navbar-nav .nav-link {
    color: var(--color-matrix-white) !important;
    font-size: 0.95rem;
    font-weight: 500;
    margin: 0 var(--spacing-md);
    position: relative;
    transition: color var(--transition-base);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--color-decision-gold) !important;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-decision-gold), var(--color-transform-blue));
    transition: width var(--transition-base);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 100%;
}

/* ============================================
   Hero Section
   ============================================ */

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-obsidian) 0%, var(--color-dark-gray) 100%);
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 50% 0%, rgba(0, 163, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    padding: var(--spacing-4xl);
}

.hero-content h1 {
    background: linear-gradient(135deg, var(--color-matrix-white) 0%, var(--color-decision-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 1s ease-out;
}

.hero-content .lead {
    color: rgba(248, 250, 252, 0.8);
    margin-bottom: var(--spacing-2xl);
    animation: fadeInUp 1s ease-out 0.2s both;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    padding: var(--spacing-md) var(--spacing-2xl);
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

.btn-gold {
    background: linear-gradient(135deg, var(--color-decision-gold) 0%, #d4a574 100%);
    color: var(--color-obsidian);
}

.btn-gold:hover {
    background: linear-gradient(135deg, #f0c574, var(--color-decision-gold));
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.btn-blue {
    background: linear-gradient(135deg, var(--color-transform-blue) 0%, #0088cc 100%);
    color: var(--color-obsidian);
}

.btn-blue:hover {
    background: linear-gradient(135deg, #00b8ff, var(--color-transform-blue));
    box-shadow: 0 0 20px rgba(0, 163, 255, 0.4);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-decision-gold);
    color: var(--color-decision-gold);
}

.btn-outline:hover {
    background: var(--color-decision-gold);
    color: var(--color-obsidian);
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-3xl);
    font-size: 1.1rem;
}

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.85rem;
}

/* ============================================
   Cards & Components
   ============================================ */

.card {
    background-color: var(--color-dark-gray);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.card:hover {
    border-color: var(--color-decision-gold);
    box-shadow: 0 0 20px rgba(226, 183, 85, 0.2);
    transform: translateY(-4px);
}

.card-body {
    padding: var(--spacing-2xl);
}

.card-title {
    color: var(--color-decision-gold);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.card-text {
    color: rgba(248, 250, 252, 0.8);
    font-size: 0.95rem;
}

/* ============================================
   Sections
   ============================================ */

section {
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.section-header h2 {
    background: linear-gradient(135deg, var(--color-matrix-white) 0%, var(--color-decision-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header p {
    font-size: 1.1rem;
    color: rgba(248, 250, 252, 0.7);
    max-width: 600px;
    margin: var(--spacing-xl) auto 0;
}

/* ============================================
   Grid & Layout
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-2xl);
}

.row {
    display: grid;
    gap: var(--spacing-2xl);
}

.row.cols-1 {
    grid-template-columns: 1fr;
}

.row.cols-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.row.cols-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.row.cols-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

@media (max-width: 768px) {
    .row.cols-3,
    .row.cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .row.cols-2,
    .row.cols-3,
    .row.cols-4 {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Metrics & Statistics
   ============================================ */

.metric-card {
    background: linear-gradient(135deg, rgba(45, 55, 72, 0.5) 0%, rgba(29, 38, 53, 0.5) 100%);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-2xl);
    text-align: center;
    backdrop-filter: blur(10px);
}

.metric-value {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-decision-gold);
    margin-bottom: var(--spacing-md);
}

.metric-label {
    font-size: 0.9rem;
    color: rgba(248, 250, 252, 0.7);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ============================================
   Footer
   ============================================ */

footer {
    background-color: var(--color-dark-gray);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    margin-top: var(--spacing-4xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-section h4 {
    color: var(--color-decision-gold);
    margin-bottom: var(--spacing-lg);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-md);
}

.footer-section a {
    color: rgba(248, 250, 252, 0.7);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer-section a:hover {
    color: var(--color-decision-gold);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-2xl);
    text-align: center;
    color: rgba(248, 250, 252, 0.6);
    font-size: 0.9rem;
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 10px rgba(226, 183, 85, 0.2);
    }
    50% {
        box-shadow: 0 0 20px rgba(226, 183, 85, 0.4);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

.animate-slide-in-left {
    animation: slideInLeft 0.8s ease-out;
}

.animate-slide-in-right {
    animation: slideInRight 0.8s ease-out;
}

/* ============================================
   Utility Classes
   ============================================ */

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-xl); }
.mt-4 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-xl); }
.mb-4 { margin-bottom: var(--spacing-2xl); }

.py-1 { padding: var(--spacing-md) 0; }
.py-2 { padding: var(--spacing-lg) 0; }
.py-3 { padding: var(--spacing-xl) 0; }
.py-4 { padding: var(--spacing-2xl) 0; }

.px-1 { padding: 0 var(--spacing-md); }
.px-2 { padding: 0 var(--spacing-lg); }
.px-3 { padding: 0 var(--spacing-xl); }
.px-4 { padding: 0 var(--spacing-2xl); }

.gap-1 { gap: var(--spacing-md); }
.gap-2 { gap: var(--spacing-lg); }
.gap-3 { gap: var(--spacing-xl); }
.gap-4 { gap: var(--spacing-2xl); }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .hero-content {
        padding: var(--spacing-2xl);
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    section {
        padding: var(--spacing-2xl) 0;
    }

    .container {
        padding: 0 var(--spacing-lg);
    }
}

@media (max-width: 576px) {
    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    h3 {
        font-size: 1rem;
    }

    .hero-section {
        min-height: 60vh;
    }

    .hero-content {
        padding: var(--spacing-lg);
    }

    .btn-lg {
        padding: var(--spacing-md) var(--spacing-2xl);
        font-size: 1rem;
    }

    section {
        padding: var(--spacing-2xl) 0;
    }

    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    body {
        background-color: white;
        color: black;
    }

    .navbar,
    footer {
        display: none;
    }

    a {
        text-decoration: underline;
    }
}