.background-effect {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: radial-gradient(circle at 10% 20%, var(--accent-glow), transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(56, 189, 248, 0.1), transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(5, 5, 8, 1) 40%, transparent 100%);
    pointer-events: none;
    transition: background 0.8s ease;
}

:root.light-mode .background-effect {
    background: radial-gradient(circle at 10% 20%, rgba(212, 175, 55, 0.15), transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.08), transparent 40%);
}

:root.light-mode .project-card,
:root.light-mode .skill-card {
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    transition: all 0.3s ease;
}

:root.light-mode .project-card:hover,
:root.light-mode .skill-card:hover {
    border-color: #111111;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transform: translateY(-5px);
}



/* Header & Nav */
header {
    background: var(--bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 15px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
    flex-wrap: wrap;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    z-index: 101;
}

.hamburger-icon {
    width: 28px;
    height: 28px;
    transition: all 0.3s ease;
}

.logo {
    color: var(--accent);
    font-size: 24px;
    font-weight: bold;
}

button.logo {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    padding: 0;
}

/* Icon Sizes */
.menu-icon,
.social-icon {
    width: 24px;
    height: 24px;
}

.project-icon {
    width: 14px;
    height: 14px;
    vertical-align: middle;
}

.contact-icon {
    width: 16px;
    height: 16px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
}

nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--accent);
}



:root {
    --bg-main: #050508;
    /* Deep space black */
    --bg-secondary: #0a0a10;
    --bg-card: rgba(20, 20, 30, 0.4);
    --text-primary: #f8f9fa;
    --text-secondary: #a1a1aa;
    --accent: #9b87f5;
    --accent-glow: rgba(155, 135, 245, 0.4);
    --font-sans: 'Inter', 'Outfit', 'Segoe UI', Roboto, Helvetica, sans-serif;
    --font-mono: 'Fira Code', monospace;
    --border-color: rgba(155, 135, 245, 0.15);
    --bg-header: rgba(5, 5, 8, 0.7);
    --bg-card-solid: #0f0f15;
    --bg-gradient-end: rgba(20, 20, 30, 0.4);
}

:root.light-mode {
    --bg-main: #f8f9fa;
    --bg-secondary: #f0f0f4;
    --bg-card: rgba(255, 255, 255, 0.7);
    --bg-card-solid: #ffffff;
    --text-primary: #18181b;
    --text-secondary: #52525b;
    --accent: #7c3aed;
    --accent-glow: rgba(124, 58, 237, 0.2);
    --border-color: rgba(124, 58, 237, 0.15);
    --bg-header: rgba(248, 249, 250, 0.8);
    --bg-gradient-end: rgba(230, 230, 240, 0.6);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.5s ease, color 0.5s ease;
    overflow-x: hidden;
    letter-spacing: 0.3px;
}

.background-effect {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: radial-gradient(circle at 10% 20%, var(--accent-glow), transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(56, 189, 248, 0.1), transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(5, 5, 8, 1) 40%, transparent 100%);
    pointer-events: none;
    transition: background 0.8s ease;
}

:root.light-mode .background-effect {
    background: radial-gradient(circle at 10% 20%, rgba(212, 175, 55, 0.15), transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.08), transparent 40%);
}

:root.light-mode .project-card,
:root.light-mode .skill-card {
    position: relative;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03);
    transition: all 0.3s ease;
}

:root.light-mode .project-card:hover,
:root.light-mode .skill-card:hover {
    border-color: #111111;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transform: translateY(-5px);
}

/* Header & Nav */
header {
    background: var(--bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 15px 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
    flex-wrap: wrap;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    z-index: 101;
}

.hamburger-icon {
    width: 28px;
    height: 28px;
    transition: all 0.3s ease;
}

.logo {
    color: var(--accent);
    font-size: 24px;
    font-weight: bold;
}

button.logo {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    padding: 0;
}

/* Icon Sizes */
.menu-icon,
.social-icon {
    width: 24px;
    height: 24px;
}

.project-icon {
    width: 14px;
    height: 14px;
    vertical-align: middle;
}

.contact-icon {
    width: 16px;
    height: 16px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
}

nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--accent);
}

.btn-primary {
    display: inline-block;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 10px 20px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: rgba(100, 255, 218, 0.1);
}



/* Theme Toggle */
.theme-li {
    display: flex;
    align-items: center;
}

.theme-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.theme-icon-svg {
    width: 18px;
    height: 18px;
    transition: all 0.3s ease;
}

.theme-btn:hover {
    background: rgba(100, 255, 218, 0.1);
    transform: rotate(15deg) scale(1.1);
}

:root.light-mode .theme-btn:hover {
    background: rgba(15, 118, 110, 0.1);
}