/* --- CSS Variables & Theming --- */
:root {
    /* Light Mode Variables */
    --bg-color: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;

    --brand-primary: #2563eb;
    --brand-secondary: #1d4ed8;
    --brand-gradient-1: #3b82f6;
    --brand-gradient-2: #8b5cf6;
    --brand-gradient-3: #ec4899;
    --brand-gradient-4: #0ea5e9;

    --font-main: 'Inter', sans-serif;
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Dark Mode Overrides (Explicit) */
[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --card-bg: #1e293b;
    --border-color: #334155;

    --brand-primary: #3b82f6;
    --brand-secondary: #60a5fa;
    --brand-gradient-1: #2563eb;
    --brand-gradient-2: #7c3aed;
    --brand-gradient-3: #db2777;
    --brand-gradient-4: #0284c7;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

/* Dark Mode OS Preference (if no explicit toggle) */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-color: #0f172a;
        --text-primary: #f8fafc;
        --text-secondary: #94a3b8;
        --card-bg: #1e293b;
        --border-color: #334155;

        --brand-primary: #3b82f6;
        --brand-secondary: #60a5fa;
        --brand-gradient-1: #2563eb;
        --brand-gradient-2: #7c3aed;
        --brand-gradient-3: #db2777;
        --brand-gradient-4: #0284c7;

        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    }
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    /* offset for sticky header */
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

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

.container-sm {
    max-width: 800px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-family: inherit;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--brand-primary);
    color: #ffffff !important;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: var(--brand-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(var(--bg-color-rgb), 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

/* Need to setup rgb background for glassmorphism */
:root {
    --bg-color-rgb: 248, 250, 252;
}

[data-theme="dark"] {
    --bg-color-rgb: 15, 23, 42;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-color-rgb: 15, 23, 42;
    }
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
}

.logo-text {
    font-weight: 800;
}

.logo-dot {
    color: var(--brand-primary);
}

.nav-list {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--brand-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s;
}

.theme-toggle:hover {
    background-color: var(--card-bg);
}

[data-theme="dark"] .icon-moon {
    display: none;
}

[data-theme="dark"] .icon-sun {
    display: block;
}

[data-theme="light"] .icon-sun {
    display: none;
}

[data-theme="light"] .icon-moon {
    display: block;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .icon-moon {
        display: none;
    }

    :root:not([data-theme="light"]) .icon-sun {
        display: block;
    }
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) .icon-sun {
        display: none;
    }

    :root:not([data-theme="dark"]) .icon-moon {
        display: block;
    }
}


/* --- Hero Section with Animated Gradient --- */
.hero {
    position: relative;
    padding: 160px 0 100px;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(-45deg,
            var(--brand-gradient-1),
            var(--brand-gradient-2),
            var(--brand-gradient-3),
            var(--brand-gradient-4));
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    opacity: 0.15;
    /* subtle */
    z-index: -1;
}

[data-theme="dark"] .hero-gradient-overlay {
    opacity: 0.08;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .hero-gradient-overlay {
        opacity: 0.08;
    }
}

@keyframes gradientBG {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.hero-container {
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--brand-primary);
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

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

/* Abstract Shapes */
.hero-shapes .shape {
    position: absolute;
    filter: blur(80px);
    border-radius: 50%;
    z-index: -2;
    opacity: 0.5;
}

.shape-1 {
    top: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background-color: var(--brand-gradient-1);
    animation: float 10s ease-in-out infinite alternate;
}

.shape-2 {
    bottom: -10%;
    right: -5%;
    width: 600px;
    height: 600px;
    background-color: var(--brand-gradient-2);
    animation: float 14s ease-in-out infinite alternate-reverse;
}

@keyframes float {
    0% {
        transform: translate(0, 0);
    }

    100% {
        transform: translate(30px, 50px);
    }
}

/* --- Services Section --- */
.services {
    padding: 50px 0;
}

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

.service-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--brand-primary);
}

.service-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--brand-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.service-desc {
    color: var(--text-secondary);
}

/* --- Approach Section --- */
.approach {
    padding: 50px 0;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.approach-list {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.approach-item {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.approach-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--border-color);
    line-height: 1;
}

.approach-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

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

/* --- Featured Work Section & Animation Elements --- */
.featured-work {
    padding: 50px 0;
}

/* Background Dimming Overlay */
.work-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.work-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* Card Base Styles */
.work-card {
    position: relative;
    cursor: pointer;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    will-change: width, height, top, left, opacity;
    padding: 0 !important;
    /* Remove inherited service-card padding */
}

/* Override existing hover to prevent jump during expand */
.service-card.work-card.expanding-active:hover,
.service-card.work-card.expanded-state:hover {
    transform: none;
    border-color: var(--border-color);
    box-shadow: var(--shadow-lg);
}

.work-card-inner {
    padding: 2rem;
    height: auto !important;
    min-height: 0 !important;
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
}

.work-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.work-badge {
    font-size: 0.75rem;
    padding: 0.4rem 0.8rem;
    color: var(--text-primary);
    background-color: transparent;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    display: inline-block;
}

.work-close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: color 0.2s, opacity 0.3s ease;
    padding: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

.work-close-btn:hover {
    color: var(--text-primary);
    background-color: rgba(128, 128, 128, 0.1);
}

.work-card.expanded-content-visible .work-close-btn {
    opacity: 1;
    visibility: visible;
}

/* Teaser Content */
.work-teaser {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    flex-grow: 1;
    transition: opacity 0.3s ease;
}

.work-summary {
    color: var(--text-secondary);
    line-height: 1.6;
    text-align: justify;
}

.work-learn-more {
    margin-top: auto;
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.work-learn-more:hover,
.work-card:hover .work-learn-more {
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

/* Expanded Content */
.work-expanded-content {
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.work-card.expanded-content-visible .work-teaser {
    display: none;
}

.work-card.expanded-content-visible .work-expanded-content {
    display: block;
    height: auto !important;
}

.work-card.expanded-content-fade-in .work-expanded-content {
    opacity: 1;
}

.work-details {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.work-details p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    text-align: justify;
}

.work-details strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* FLIP Animation Classes */
.work-card.expanding-active {
    position: fixed;
    z-index: 1001;
    cursor: default;
    box-shadow: var(--shadow-lg);
}

/* --- Contact Section --- */
.contact {
    padding: 50px 0;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

.contact-card {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 4rem;
    box-shadow: var(--shadow-md);
}

.contact-details {
    margin-top: 2rem;
}

.contact-details p {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.contact-details strong {
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

/* --- Footer --- */
.footer {
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 2rem;
}

.footer-desc {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--brand-primary);
}

.footer-copy {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 900px) {
    .contact-card {
        grid-template-columns: 1fr;
        padding: 2rem;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 3rem;
    }

    .nav {
        display: none;
        /* simple mobile behavior for now */
    }

    .hero-cta {
        flex-direction: column;
    }

    .contact-card {
        padding: 2rem;
    }
}