/* 
 * GradientFAB Design System 
 * STRICT Unchangeable Parameters:
 * - Accent: #C1332F
 * - Dark:   #262626
 * - Light:  #D9D9D9
 */

:root {
    /* Core Primitives */
    --color-accent: #C1332F;
    --color-accent-rgb: 193, 51, 47;
    --color-dark: #262626;
    --color-dark-rgb: 38, 38, 38;
    --color-light: #D9D9D9;
    --color-light-rgb: 217, 217, 217;

    /* Theme Defaults (Light Mode) */
    --color-bg: #f4f4f4;
    /* Slightly lighter than pure Light for contrast, derived from palette */
    --color-bg-mesh: linear-gradient(135deg, rgba(217, 217, 217, 0.1) 0%, rgba(38, 38, 38, 0.05) 100%);
    --color-text: var(--color-dark);
    --color-surface: rgba(255, 255, 255, 0.7);
    /* High opacity for glass */
    --color-surface-hover: rgba(255, 255, 255, 0.9);

    /* Monochromatic consistency */
    --color-border: rgba(38, 38, 38, 0.1);

    /* Typography & Layout */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --container-width: 1200px;
    --header-height: 80px;
    --border-radius: 12px;
    /* Smoother corners */

    --shadow-sm: 0 2px 4px rgba(38, 38, 38, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(38, 38, 38, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(38, 38, 38, 0.1), 0 4px 6px -2px rgba(38, 38, 38, 0.05);
    --shadow-glow: 0 0 20px rgba(193, 51, 47, 0.15);

    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --backdrop-blur: blur(12px);
}

@media (prefers-color-scheme: dark) {
    :root {
        /* Theme Overrides (Dark Mode) */
        --color-bg: #1a1a1a;
        /* Darker than base Dark for depth */
        --color-bg-mesh: linear-gradient(135deg, rgba(38, 38, 38, 1) 0%, rgba(20, 20, 20, 1) 100%);
        --color-text: #f0f0f0;
        --color-surface: rgba(38, 38, 38, 0.6);
        --color-surface-hover: rgba(38, 38, 38, 0.8);
        --color-border: rgba(217, 217, 217, 0.1);
    }
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 20px);
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    background-image: var(--color-bg-mesh);
    background-attachment: fixed;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-base);
}

/* 
a:hover {
    opacity: 0.8;
} */

ul {
    list-style: none;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--color-text);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.01em;
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-accent);
}

p {
    margin-bottom: 1.5rem;
    /* max-width: 65ch; */
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 50px 0;
    border-bottom: 1px solid var(--color-border);
}

section:last-of-type {
    border-bottom: none;
}

/* Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-accent);
    color: #fff;
    /* Always white on accent */
    padding: 10px 24px;
    border-radius: 50px;
    /* Pill shape for premium feel */
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.02em;
    transition: all var(--transition-base);
    border: 1px solid transparent;
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 15px rgba(193, 51, 47, 0.4);
}

/* .btn:hover {
    transform: translateY(-2px);
    /* box-shadow: var(--shadow-md); */
/* opacity: 0.9; */



/* Header */
header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.8);
    /* Fallback */
    background-color: var(--color-surface);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

@media (prefers-color-scheme: dark) {
    header {
        background-color: rgba(38, 38, 38, 0.8);
    }
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    max-height: 72px;
    height: auto;
    width: auto;
    flex-shrink: 0;
}

/* Logo Visibility Logic */
.logo-light {
    display: block;
    /* Show White Logo in Light Mode */
}

.logo-dark {
    display: none;
    /* Hide Black Logo in Light Mode */
}

@media (prefers-color-scheme: dark) {
    .logo-light {
        display: none;
        /* Hide White Logo in Dark Mode */
    }

    .logo-dark {
        display: block;
        /* Show Black Logo in Dark Mode */
    }
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
    /* Above mobile menu */
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    position: relative;
    transition: background var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform var(--transition-base), top var(--transition-base);
    left: 0;
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    top: 6px;
}

/* Hamburger Open State */
.mobile-nav-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-nav-toggle[aria-expanded="true"] .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

@media (max-width: 768px) {
    .mobile-nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        inset: var(--header-height) 0 auto 60%;
        /* Top Right Bottom Left */
        background: var(--color-bg);
        padding: 1rem;
        transform: translateX(101%);
        transition: transform 0.3s ease-in-out;
        z-index: 1000;
        display: flex;
        flex-direction: column;
        gap: 1.5rem;
        box-shadow: -10px 10px 20px rgba(0, 0, 0, 0.1);
        border-left: 1px solid var(--color-border);
        border-bottom: 1px solid var(--color-border);
    }

    .nav-menu[data-visible="true"] {
        transform: translateX(0%);
    }

    .nav-link {
        font-size: 1.25rem;
        justify-content: center;
        /* padding-left: 0; */
    }
}



/* Hero */
#hero {
    /* min-height: 80vh; */
    display: flex;
    align-items: center;
    margin-top: var(--header-height);
    padding-top: 20px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
    animation: fadeUp 0.8s ease-out forwards;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-render {
    width: 100%;
    height: auto;
    /* border-radius: var(--border-radius); */
    /* box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2); */
    /* border: 1px solid rgba(255, 255, 255, 0.1); */
    /* transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1); */
}

/* 
.hero-render:hover {
    transform: scale(1.02);
} */

@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-image {
        order: -1;
        max-width: 500px;
        margin: 0 auto;
    }

    .gap-sm {
        justify-content: center;
    }
}

.hero-tagline {
    /* font-size: 1.25rem; */
    color: var(--color-accent);
    /* font-weight: 500; */
    /* display: block;
    margin-bottom: 1.5rem; */
    /* text-transform: uppercase; */
    /* letter-spacing: 0.05em; */
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--color-text);
    opacity: 0.8;
    margin-bottom: 2.5rem;
}

/* Application Grid */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 4rem;
}

.app-card {
    background: var(--color-surface);
    backdrop-filter: blur(5px);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 0;
    overflow: hidden;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.app-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--color-accent);
}

.app-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    /* background: #000; */
    /* Dark background for renders */
    border-bottom: 1px solid var(--color-border);
}

.app-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

/* 
.app-card:hover .app-image img {
    transform: scale(1.05);
} */


.app-card h3 {
    margin: 1.5rem 1.5rem 0.5rem;
    /* Inherits font-size (1.5rem) and color from global h3 */
}

.app-card p {
    margin: 0 1.5rem 1.5rem;
    font-size: 0.95rem;
    opacity: 0.9;
}

/* Features/About */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-top: 2rem;
}

/* Tech Cards */
.tech-card {
    background: var(--color-surface);
    backdrop-filter: blur(5px);
    padding: 40px;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.tech-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--color-accent);
}

.tech-card ul {
    margin-top: 1.5rem;
    padding-left: 0;
}

.tech-card li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 10px;
    opacity: 0.9;
}

.tech-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* Footer */
footer {
    padding: 60px 0;
    border-top: 1px solid var(--color-border);
    margin-top: 60px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-info p {
    margin-bottom: 0.5rem;
    opacity: 0.7;
}

/* Animations */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    will-change: opacity, visibility;
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: none;
}

/* Utilities (replacing inline styles) */
.nav-link {
    background: transparent;
    color: var(--color-text);
    padding: 8px 16px;
    border: 1px solid transparent;
}

/* 
.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text);
} */


.gap-sm {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.mt-lg {
    margin-top: 3rem;
}

.text-highlight {
    font-size: 1.1rem;
    color: var(--color-text);
}

.tech-card-fs {
    background: var(--color-bg);
}

.tech-card-si {
    background: var(--color-bg);
}

/* Scroll Offset Fix */
html {
    scroll-padding-top: calc(var(--header-height) + 20px);
}