:root {
    --bg-color: #0d1117;
    --panel-bg: rgba(22, 27, 34, 0.7);
    --border-color: rgba(240, 246, 252, 0.1);
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --accent-blue: #58a6ff;
    --accent-purple: #bc8cff;
    --accent-green: #3fb950;
    --gradient: linear-gradient(135deg, #58a6ff, #bc8cff);
    --font-heading: 'Play', sans-serif;
    --font-body: 'Play', sans-serif;
    --shadow-premium: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --glass-bg: rgba(22, 27, 34, 0.6);
}

[data-theme="light"] {
    --bg-color: #f6f8fa;
    --panel-bg: rgba(255, 255, 255, 0.8);
    --border-color: rgba(31, 35, 40, 0.1);
    --text-primary: #1f2328;
    --text-secondary: #636c76;
    --accent-blue: #0969da;
    --accent-purple: #8250df;
    --gradient: linear-gradient(135deg, #0969da, #8250df);
    --shadow-premium: 0 8px 32px 0 rgba(140, 149, 159, 0.2);
    --glass-bg: rgba(255, 255, 255, 0.7);
}

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

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(circle at 50% -20%, var(--panel-bg) 0%, var(--bg-color) 100%);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    -webkit-user-select: none;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--accent-blue);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

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

/* Skeleton Loader */
#skeleton-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg-color);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.loader-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.loader-icon-wrapper {
    position: relative;
    width: 100px;
    height: 100px;
    margin-bottom: 2rem;
}

.loader-icon {
    width: 100%;
    height: 100%;
    animation: pulse 2s infinite ease-in-out;
}

.loader-progress-container {
    width: 200px;
    height: 4px;
    background: var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    margin: 1rem auto;
}

#splash-progress-bar {
    width: 0%;
    height: 100%;
    background: var(--gradient);
    transition: width 0.1s linear;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.1);
        opacity: 0.7;
    }
}

/* Hero Section */
.hero {
    padding: 2rem 2rem 1rem;
    text-align: center;
}

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

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

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

.glass-panel {
    background: linear-gradient(-45deg, var(--glass-bg), rgba(88, 166, 255, 0.1), var(--glass-bg), rgba(188, 140, 255, 0.1));
    background-size: 400% 400%;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 4rem;
    box-shadow: var(--shadow-premium);
    position: relative;
    max-width: 1100px;
    margin: 0 auto;
    animation: gradientBG 15s ease infinite;
    transition: all 0.4s ease;
}

.glass-panel:hover {
    transform: translateY(-8px);
    border-color: var(--accent-blue);
    box-shadow: 0 20px 50px rgba(88, 166, 255, 0.15);
}

/* UI Controls */
.top-controls {
    position: absolute;
    top: 2rem;
    right: 2rem;
    display: flex;
    gap: 1rem;
    z-index: 100;
}

.control-btn {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.2rem;
}

.control-btn:hover {
    transform: translateY(-3px) scale(1.05);
    border-color: var(--accent-blue);
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.2);
}

/* Hero Identity Grid */
.hero-identity-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.profile-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.author-pill {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.author-pill:hover {
    transform: translateY(-5px) scale(1.02);
    border-color: var(--accent-blue);
    background: var(--panel-bg);
    box-shadow: 0 10px 20px rgba(88, 166, 255, 0.15);
}

.author-pill img {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--accent-blue);
    transition: all 0.5s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: transform;
}

.author-pill:hover img {
    transform: scale(1.2) rotate(5deg);
    border-color: #fff;
    box-shadow: 0 0 15px rgba(88, 166, 255, 0.4);
}

.author-pill span {
    font-weight: 600;
    font-size: 0.9rem;
}

/* Repo Pill */
.hero-repo-link {
    margin-bottom: 2.5rem;
    display: flex;
    justify-content: center;
}

.repo-pill {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--accent-blue);
    padding: 0.6rem 1.75rem;
    border-radius: 50px;
    border: 1px solid var(--accent-blue);
    text-decoration: none;
    color: #fff;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.repo-pill:hover {
    transform: translateY(-5px) scale(1.05);
    filter: brightness(1.1);
    box-shadow: 0 10px 25px rgba(88, 166, 255, 0.4);
}

.premium-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 2.5rem;
}

/* Progress Stats */
.hero-stats-merge {
    display: flex;
    justify-content: space-around;
    margin-top: 3rem;
    flex-wrap: wrap;
    gap: 2rem;
}

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

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-blue);
    display: block;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Featured Project Card */
.featured-section {
    margin-top: 5rem;
}

.section-title {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 3.5rem;
    text-align: center;
    position: relative;
}

section {
    margin-top: 2rem;
    margin-bottom: 3.5rem;
}

.featured-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 32px;
    padding: 3.5rem;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    overflow: hidden;
    align-items: center;
    position: relative;
    will-change: transform, box-shadow;
    backface-visibility: hidden;
}

.featured-card:hover,
.featured-card.active:hover {
    transform: translateY(-12px) scale(1.01);
    border-color: var(--accent-blue);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5), 0 0 30px rgba(88, 166, 255, 0.1);
}

.featured-left {
    display: flex;
    flex-direction: column;
    gap: 2.2rem;
    align-items: center;
    width: 100%;
}

.featured-video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    /* 16:9 Aspect Ratio */
    height: 0;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    background: #161b22;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    border: 1px solid transparent;
    will-change: transform, box-shadow;
    backface-visibility: hidden;
}

/* Video Loading Shimmer */
.featured-video-wrapper::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(88, 166, 255, 0.05), transparent);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite linear;
    z-index: 1;
    pointer-events: none;
}

.featured-video-wrapper.loaded::after {
    display: none;
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }

    100% {
        background-position: 200% 0;
    }
}

.featured-video-wrapper:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(88, 166, 255, 0.2);
    border-color: var(--accent-blue);
}

.featured-video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 20px;
}

.featured-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
    width: 100%;
    margin-top: 1.5rem;
}

.action-pill {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.7rem;
    padding: 0.85rem 0.5rem;
    border-radius: 12px;
    font-weight: 700;
    font-size: 0.78rem;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    text-align: center;
    white-space: nowrap;
    border: 1px solid transparent;
    width: 100%;
    box-sizing: border-box;
    will-change: transform, box-shadow;
}

.action-pill.yt-btn {
    background: rgba(255, 0, 0, 0.1);
    color: #ff0000;
    border: 1px solid rgba(255, 0, 0, 0.2);
}

.action-pill.yt-btn:hover {
    background: #ff0000;
    color: #fff;
    border-color: #ff0000;
}

.featured-badge {
    display: inline-block;
    background: rgba(88, 166, 255, 0.1);
    color: var(--accent-blue);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(88, 166, 255, 0.2);
    width: fit-content;
}

.featured-content h3 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.featured-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.featured-features {
    display: grid;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.feature-item i {
    color: var(--accent-blue);
    font-size: 1.1rem;
}

.action-pill.primary {
    background: var(--accent-blue);
    color: var(--bg-color);
}

.action-pill.primary:hover {
    filter: brightness(1.1);
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 10px 20px rgba(88, 166, 255, 0.3);
}

.action-pill.secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.action-pill.secondary:hover {
    background: var(--panel-bg);
    border-color: var(--accent-blue);
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 10px 20px rgba(88, 166, 255, 0.1);
}

/* Day Grid */
.day-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.day-card {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 2.5rem 1.5rem;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 280px;
    position: relative;
    overflow: hidden;
    will-change: transform, box-shadow;
    backface-visibility: hidden;
}

.day-card:hover,
.day-card.active:hover {
    transform: translateY(-15px) scale(1.02);
    border-color: var(--accent-blue);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5), 0 0 30px rgba(88, 166, 255, 0.2);
}

.day-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(88, 166, 255, 0.05), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.day-card:hover::before {
    opacity: 1;
}

.day-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.day-number {
    font-weight: 800;
    color: var(--accent-blue);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.day-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.day-actions {
    display: flex;
    gap: 1rem;
}

.action-btn {
    flex: 1;
    padding: 0.6rem;
    border-radius: 12px;
    text-align: center;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    will-change: transform, box-shadow;
}

.action-btn.kaggle {
    background: rgba(32, 190, 255, 0.1);
    color: #20beff;
    border-color: rgba(32, 190, 255, 0.3);
}

.action-btn.kaggle:hover {
    background: #20beff;
    color: #fff;
    transform: translateY(-5px) scale(1.08);
    box-shadow: 0 10px 20px rgba(32, 190, 255, 0.4);
}

.action-btn.colab {
    background: rgba(249, 171, 0, 0.1);
    color: #f9ab00;
    border-color: rgba(249, 171, 0, 0.3);
}

.action-btn:hover {
    transform: translateY(-5px) scale(1.08);
}

.action-btn.kaggle:hover {
    background: #20beff;
    color: #fff;
    box-shadow: 0 10px 20px rgba(32, 190, 255, 0.4);
    transform: translateY(-5px) scale(1.08);
}

.action-btn.colab:hover {
    background: #f9ab00;
    color: #fff;
    box-shadow: 0 10px 20px rgba(249, 171, 0, 0.4);
    transform: translateY(-5px) scale(1.08);
}

.action-btn.expand:hover {
    background: var(--text-primary);
    color: var(--bg-color);
    box-shadow: 0 10px 20px rgba(255, 255, 255, 0.2);
    transform: translateY(-5px) scale(1.08);
}

/* Certificates */
.cert-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.cert-card {
    background: var(--panel-bg);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: transform, box-shadow;
    backface-visibility: hidden;
}

.cert-card:hover,
.cert-card.active:hover {
    transform: scale(1.03) translateY(-15px);
    border-color: var(--accent-purple);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5), 0 0 30px rgba(160, 101, 245, 0.2);
}

.cert-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    object-position: top;
    transition: transform 0.5s ease;
}

.cert-card:hover .cert-image {
    transform: scale(1.1);
}

.cert-info {
    padding: 1.5rem;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    z-index: 20000;
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 1200px;
    height: 85vh;
    background: var(--bg-color);
    border-radius: 24px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

#cert-modal .modal-content {
    background: transparent;
    border: none;
    width: 95%;
    max-width: 800px;
    height: auto;
    max-height: 90vh;
}

#cert-full-image {
    width: 100%;
    height: auto;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.8);
    margin-bottom: 0;
}

.modal-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
}

.modal-controls {
    display: flex;
    gap: 0.75rem;
    margin-left: auto;
}

.control-icon-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.control-icon-btn:hover {
    background: var(--accent-blue);
    color: var(--bg-color);
    transform: translateY(-2px);
    border-color: var(--accent-blue);
}

.close-modal {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    cursor: pointer;
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Theme Toggle */
.top-controls {
    position: absolute;
    top: 2rem;
    right: 2rem;
    z-index: 5000;
    display: flex;
    gap: 1rem;
}

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--panel-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 4999;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
}

#back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

#back-to-top:hover {
    background: var(--accent-blue);
    color: var(--bg-color);
    transform: translateY(-5px);
}

.control-btn {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1.1rem;
    padding: 0;
    /* Clear any default padding */
}

.control-btn:hover {
    transform: translateY(-3px) scale(1.05);
    border-color: var(--accent-blue);
    box-shadow: 0 4px 12px rgba(88, 166, 255, 0.2);
    background: var(--bg-color);
}

@media (max-width: 768px) {
    .premium-title {
        font-size: 2.8rem;
        line-height: 1.1;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .glass-panel {
        padding: 2.5rem 1.5rem;
    }

    .featured-card {
        grid-template-columns: 1fr;
        padding: 2rem;
        gap: 2.5rem;
        text-align: center;
    }

    .featured-left {
        width: 100%;
    }

    .featured-actions {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .featured-badge {
        margin: 0 auto 1.5rem;
    }

    .featured-features {
        justify-content: center;
    }

    .cert-grid {
        grid-template-columns: 1fr;
    }

    .hero-identity-grid {
        gap: 1rem;
    }

    .day-grid {
        grid-template-columns: 1fr;
    }

    .top-controls {
        top: 1rem;
        right: 1rem;
    }
}

@media (max-width: 480px) {
    .premium-title {
        font-size: 2.2rem;
    }

    .stat-value {
        font-size: 2.2rem;
    }
}

/* Footer */
.main-footer {
    padding: 4rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.author-link {
    color: var(--text-primary) !important;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.author-link:hover {
    color: var(--accent-blue) !important;
}

/* Certificate Modal High-Contrast Fix */
#cert-modal .modal-header h3,
#cert-modal .close-modal {
    color: #fff !important;
}

#cert-modal .action-btn {
    background: rgba(255, 255, 255, 0.1) !important;
    color: #fff !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
}

#cert-modal #download-cert-link {
    background: var(--accent-blue) !important;
    border-color: var(--accent-blue) !important;
}

#cert-modal .action-btn:hover {
    background: rgba(255, 255, 255, 0.2) !important;
    border-color: #fff !important;
}

#cert-modal #download-cert-link:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
}