/* ==========================================================================
   ANGSUMAN DAS - SOOTHING EDITORIAL & MINIMAL DESIGN SYSTEM
   Default: Soothing Warm Light Canvas (#FAF9F5) + Slate & Sage Accents
   Dark Theme: Serene Slate (#0D1117)
   ========================================================================== */

:root {
    --bg-canvas: #faf9f5;
    --bg-card: #ffffff;
    --bg-card-hover: #f4f3ee;
    --bg-elevation: #eae8e1;
    
    --accent-teal: #0284c7;
    --accent-teal-dim: rgba(2, 132, 199, 0.08);
    --accent-sage: #2d6a4f;
    --accent-sage-dim: rgba(45, 106, 79, 0.08);
    --accent-amber: #d97706;
    --accent-amber-dim: rgba(217, 119, 6, 0.08);
    
    --text-main: #1a1d20;
    --text-sub: #4b5563;
    --text-muted: #6b7280;
    
    --border-subtle: #e5e3dc;
    --border-hover: rgba(2, 132, 199, 0.4);
    
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
    
    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-canvas: #0d1117;
    --bg-card: #161b22;
    --bg-card-hover: #1c2128;
    --bg-elevation: #21262d;
    
    --accent-teal: #38bdf8;
    --accent-teal-dim: rgba(56, 189, 248, 0.12);
    --accent-sage: #34d399;
    --accent-sage-dim: rgba(52, 211, 153, 0.12);
    --accent-amber: #f59e0b;
    --accent-amber-dim: rgba(245, 158, 11, 0.12);
    
    --text-main: #f0f6fc;
    --text-sub: #c9d1d9;
    --text-muted: #8b949e;
    
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(56, 189, 248, 0.35);
    
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 16px 36px rgba(0, 0, 0, 0.45);
}

*, *::before, *::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 95px;
    background-color: var(--bg-canvas);
    color: var(--text-main);
    transition: background-color 0.3s var(--ease-smooth), color 0.3s var(--ease-smooth);
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-canvas);
    color: var(--text-main);
    font-family: var(--font-sans);
    overflow-x: hidden;
    line-height: 1.65;
    letter-spacing: -0.01em;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s var(--ease-smooth), color 0.3s var(--ease-smooth);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
    width: 7px;
    height: 7px;
}

::-webkit-scrollbar-track {
    background: var(--bg-canvas);
}

::-webkit-scrollbar-thumb {
    background: rgba(2, 132, 199, 0.25);
    border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-teal);
}

::selection {
    background: rgba(2, 132, 199, 0.2);
    color: var(--text-main);
}

/* Navigation Links */
.nav-item {
    color: var(--text-muted);
    text-decoration: none;
    position: relative;
    padding-bottom: 4px;
    transition: color 0.2s var(--ease-smooth);
    font-weight: 500;
}

.nav-item:hover, .nav-item.active {
    color: var(--text-main);
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-teal);
    border-radius: 9999px;
}

/* Ambient Vector Pattern Layer */
.hero-bg-dna {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    pointer-events: none;
    background-image: 
        radial-gradient(circle at 15% 20%, var(--accent-teal-dim) 0%, transparent 45%),
        radial-gradient(circle at 85% 65%, var(--accent-sage-dim) 0%, transparent 50%);
    z-index: 0;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    width: 38px;
    height: 38px;
    border-radius: 9999px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s var(--ease-smooth);
    box-shadow: var(--shadow-card);
}

.theme-toggle-btn:hover {
    border-color: var(--border-hover);
    color: var(--accent-teal);
    transform: scale(1.05);
}

/* Action Buttons & Pills */
.btn-teal-solid {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.4rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #ffffff;
    background: var(--accent-teal);
    border: 1px solid var(--accent-teal);
    text-decoration: none;
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.25);
    transition: all 0.2s var(--ease-smooth);
    cursor: pointer;
}

.btn-teal-solid:hover {
    background: #0369a1;
    border-color: #0369a1;
    box-shadow: 0 6px 18px rgba(2, 132, 199, 0.35);
    transform: translateY(-1px);
}

[data-theme="dark"] .btn-teal-solid {
    color: #0d1117;
}

.btn-teal-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-teal);
    background: transparent;
    border: 1px solid var(--accent-teal);
    text-decoration: none;
    transition: all 0.2s var(--ease-smooth);
    cursor: pointer;
}

.btn-teal-outline:hover {
    background: var(--accent-teal-dim);
    transform: translateY(-1px);
}

.btn-glass-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1.25rem;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-sub);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    text-decoration: none;
    box-shadow: var(--shadow-card);
    transition: all 0.2s var(--ease-smooth);
}

.btn-glass-pill:hover {
    border-color: var(--border-hover);
    color: var(--text-main);
    transform: translateY(-1px);
    box-shadow: var(--shadow-hover);
}

.icon-btn-teal {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.65rem;
    border-radius: 8px;
    font-size: 0.725rem;
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-sub);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s var(--ease-smooth);
}

.icon-btn-teal:hover {
    color: var(--accent-teal);
    border-color: var(--accent-teal);
    background: var(--accent-teal-dim);
}

/* Card Containers */
.soothing-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 1rem;
    box-shadow: var(--shadow-card);
    transition: all 0.25s var(--ease-smooth);
}

.soothing-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.skill-icon-box {
    padding: 0.6rem 0.4rem;
    border-radius: 10px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    transition: all 0.2s var(--ease-smooth);
}

.skill-icon-box:hover {
    border-color: var(--accent-teal);
    background: var(--accent-teal-dim);
    transform: translateY(-2px);
}

.paper-box {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 1rem;
    box-shadow: var(--shadow-card);
    transition: transform 0.25s var(--ease-smooth), border-color 0.25s var(--ease-smooth), box-shadow 0.25s var(--ease-smooth);
}

.paper-box:hover {
    transform: translateY(-3px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-hover);
}

.stat-box {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 1.25rem;
    padding: 1.25rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    height: 13.5rem;
    box-shadow: var(--shadow-card);
    transition: all 0.25s var(--ease-smooth);
}

.stat-box:hover {
    border-color: var(--accent-teal);
    background: var(--bg-card-hover);
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

/* Category Filter Tabs */
.tab-filter-btn {
    padding: 0.4rem 1rem;
    border-radius: 9999px;
    font-size: 0.775rem;
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    transition: all 0.2s var(--ease-smooth);
}

.tab-filter-btn:hover, .tab-filter-btn.active {
    color: var(--accent-teal);
    border-color: var(--accent-teal);
    background: var(--accent-teal-dim);
}

/* Eyebrow Tags */
.eyebrow-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.7rem;
    font-family: var(--font-mono);
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    background: var(--accent-teal-dim);
    color: var(--accent-teal);
    border: 1px solid rgba(2, 132, 199, 0.25);
}

/* Footer Contact Pill */
.footer-contact-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1.25rem;
    border-radius: 9999px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    text-decoration: none;
    box-shadow: var(--shadow-card);
    transition: all 0.2s var(--ease-smooth);
}

.footer-contact-card:hover {
    border-color: var(--accent-teal);
    background: var(--accent-teal-dim);
}

.social-footer-link {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s var(--ease-smooth);
}

.social-footer-link:hover {
    color: var(--accent-teal);
}

/* Modals & Lightbox System (STRICT HIDDEN DEFAULT STATE) */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(26, 29, 32, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    display: none !important;
    visibility: hidden !important;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s var(--ease-smooth), visibility 0.25s var(--ease-smooth);
}

[data-theme="dark"] .modal-backdrop {
    background: rgba(13, 17, 23, 0.85);
}

.modal-backdrop.active {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
    pointer-events: auto !important;
}

.modal-container {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 1.25rem;
    max-width: 540px;
    width: 90%;
    padding: 2rem;
    transform: scale(0.95);
    transition: transform 0.25s var(--ease-smooth);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.25);
}

.modal-backdrop.active .modal-container {
    transform: scale(1);
}

/* Lightbox Modal (For Document Previews) */
.lightbox-container {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 1.25rem;
    max-width: 920px;
    width: 94%;
    height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35);
}

/* Responsive Rules */
@media (max-width: 1024px) {
    .hero-bg-dna {
        opacity: 0.5;
    }
}