/* ==========================================================================
   CSS Variables & Theme System
   ========================================================================== */
:root {
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    
    /* Spacing System */
    --space-xs: 0.25rem;  /* 4px */
    --space-sm: 0.5rem;   /* 8px */
    --space-md: 1rem;     /* 16px */
    --space-lg: 1.5rem;   /* 24px */
    --space-xl: 2rem;     /* 32px */
    --space-xxl: 3rem;    /* 48px */
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-pill: 9999px;
    --radius-circle: 50%;
    
    /* Transitions */
    --transition-fast: 0.2s ease-out;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index Layers */
    --z-negative: -1;
    --z-base: 1;
    --z-sticky: 100;
    --z-dropdown: 200;
    --z-overlay: 900;
    --z-drawer: 1000;
    --z-toast: 2000;

    /* Base Dimensions */
    --max-width: 600px;
    --header-height: 60px;
}

/* Default Theme (Dark Mode Base) */
:root, [data-theme="dark"] {
    --bg-color-1: #0f172a;
    --bg-color-2: #1e293b;
    --bg-gradient: linear-gradient(135deg, var(--bg-color-1) 0%, var(--bg-color-2) 100%);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-color: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.4);
    --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
    
    --glass-bg: rgba(30, 41, 59, 0.6);
    --glass-bg-hover: rgba(51, 65, 85, 0.8);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: 12px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--accent-glow);
    
    --success-color: #10b981;
    --error-color: #ef4444;
    --skeleton-base: #1e293b;
    --skeleton-highlight: #334155;
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-color-1: #f8fafc;
    --bg-color-2: #e2e8f0;
    --bg-gradient: linear-gradient(135deg, var(--bg-color-1) 0%, var(--bg-color-2) 100%);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --accent-color: #0284c7;
    --accent-glow: rgba(2, 132, 199, 0.3);
    --accent-gradient: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
    
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-hover: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.05);
    --glass-blur: 16px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px var(--accent-glow);
    
    --success-color: #059669;
    --error-color: #dc2626;
    --skeleton-base: #cbd5e1;
    --skeleton-highlight: #f1f5f9;
}

/* Auto Theme Fallback based on OS preference (if JS is not overriding) */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --bg-color-1: #f8fafc;
        --bg-color-2: #e2e8f0;
        --bg-gradient: linear-gradient(135deg, var(--bg-color-1) 0%, var(--bg-color-2) 100%);
        --text-primary: #0f172a;
        --text-secondary: #475569;
        --text-muted: #94a3b8;
        --accent-color: #0284c7;
        --accent-glow: rgba(2, 132, 199, 0.3);
        --accent-gradient: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
        --glass-bg: rgba(255, 255, 255, 0.7);
        --glass-bg-hover: rgba(255, 255, 255, 0.9);
        --glass-border: rgba(0, 0, 0, 0.05);
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
        --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.1);
        --skeleton-base: #cbd5e1;
        --skeleton-highlight: #f1f5f9;
    }
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background var(--transition-slow), color var(--transition-slow);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color-1);
}
::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: var(--radius-pill);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Selection Color */
::selection {
    background: var(--accent-glow);
    color: var(--text-primary);
}

/* Focus Utility for Accessibility */
:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 4px;
    border-radius: 4px;
}

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
    color: inherit;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */
#main-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: calc(var(--header-height) + var(--space-xl)) var(--space-md) var(--space-xxl);
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    animation: fadeIn var(--transition-slow);
}

/* ==========================================================================
   Sticky Top Action
   ========================================================================== */
.top-action-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--space-md);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom: 1px solid var(--glass-border);
    z-index: var(--z-sticky);
    transition: background var(--transition-normal);
}

.action-btn {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-circle);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.action-btn:hover, .action-btn:active {
    background: var(--glass-bg-hover);
    transform: scale(1.05);
}

/* ==========================================================================
   Navigation Drawer & Overlay
   ========================================================================== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: var(--z-overlay);
    opacity: 1;
    transition: opacity var(--transition-normal);
}

.overlay[hidden] {
    display: block !important;
    opacity: 0;
    pointer-events: none;
}

.navigation-drawer {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    max-width: 80vw;
    background: var(--bg-color-2);
    border-right: 1px solid var(--glass-border);
    z-index: var(--z-drawer);
    transform: translateX(0);
    transition: transform var(--transition-normal);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-md);
}

.navigation-drawer[hidden] {
    display: flex !important;
    transform: translateX(-100%);
}

.drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--glass-border);
}

.drawer-title {
    font-weight: 700;
    font-size: 1.1rem;
}

.close-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-circle);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: var(--glass-bg-hover);
    color: var(--error-color);
}

.drawer-menu {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    overflow-y: auto;
}

.menu-link {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.menu-link i {
    width: 20px;
    text-align: center;
    font-size: 1.1rem;
}

.menu-link:hover, .menu-link:focus-visible {
    background: var(--glass-bg);
    color: var(--accent-color);
    padding-left: var(--space-lg);
}

.highlight-link {
    margin-top: var(--space-md);
    background: var(--accent-gradient);
    color: #fff !important;
    text-align: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.highlight-link:hover {
    transform: translateY(-2px);
    padding-left: var(--space-md); /* Override hover padding */
}

/* ==========================================================================
   Header / Hero Section
   ========================================================================== */
.hero-section {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.profile-container {
    position: relative;
    width: 120px;
    height: 120px;
    margin-bottom: var(--space-md);
    border-radius: var(--radius-circle);
    padding: 4px;
    background: var(--accent-gradient);
    box-shadow: var(--shadow-glow);
    animation: float 6s ease-in-out infinite;
}

.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-circle);
    border: 4px solid var(--bg-color-1);
    background: var(--bg-color-2);
}

/* Theme Toggle Button (Prepared for JS integration) */
.theme-toggle-btn {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-circle);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    z-index: 2;
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
    background: var(--glass-bg-hover);
    color: var(--accent-color);
}

.theme-toggle-btn:active {
    transform: scale(0.95);
}

.user-name {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.user-subtitle {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--accent-color);
}

.user-bio {
    font-size: 0.9rem;
    color: var(--text-secondary);
    max-width: 90%;
    margin: var(--space-sm) auto 0;
}

/* ==========================================================================
   Contact Section
   ========================================================================== */
.contact-section {
    display: flex;
    justify-content: center;
    width: 100%;
}

.contact-links {
    display: flex;
    gap: var(--space-md);
}

.contact-btn {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-circle);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.contact-btn:hover {
    transform: translateY(-4px);
    background: var(--glass-bg-hover);
    color: var(--accent-color);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    border-color: var(--accent-color);
}

.contact-btn:active {
    transform: translateY(0) scale(0.95);
}

/* ==========================================================================
   Bio Link / Accordion Section
   ========================================================================== */
.accordion-section {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.accordion-item {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.accordion-item:hover {
    background: var(--glass-bg-hover);
    box-shadow: var(--shadow-sm);
}

.accordion-header {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: background var(--transition-fast);
}

.accordion-title {
    display: inline;
}

.accordion-title i {
    color: var(--accent-color);
    padding-right: 3px;
}

.accordion-icon {
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: transform var(--transition-normal);
}

.accordion-header[aria-expanded="true"] .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    padding: 0 var(--space-lg) var(--space-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid transparent;
    transition: all var(--transition-normal);
}

.accordion-content[hidden] {
    display: none;
}

.accordion-header[aria-expanded="true"] + .accordion-content {
    border-top-color: var(--glass-border);
    padding-top: var(--space-md);
}

/* Timeline & Skill List Inside Accordion */
.timeline-item {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-md);
    border-left: 2px solid var(--glass-border);
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 10px;
    width: 10px;
    height: 10px;
    border-radius: var(--radius-circle);
    background: var(--accent-color);
    box-shadow: 0 0 8px var(--accent-glow);
}

.job-title, .edu-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.job-company, .edu-school {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent-color);
}

.job-date, .edu-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.job-description {
    list-style: disc;
    padding-left: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.skill-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.skill-list strong {
    color: var(--text-primary);
}

/* ==========================================================================
   Certificate Section
   ========================================================================== */
.certificate-section {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.section-title {
    font-size: 1.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-sm);
}

/* Slider */
.certificate-slider-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-color-1);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--glass-border);
}

/* =======================================
   PERUBAHAN UNTUK SERTIFIKAT SLIDER
   ======================================= */
.slider-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-start; /* Berubah dari center agar sejajar ke kiri */
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1); /* Animasi geser yang smooth */
    will-change: transform;
}

.certificate-image {
    flex: 0 0 100%; /* Wajib: Memaksa gambar selalu mengambil lebar penuh 100% */
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0.3; /* Meredupkan gambar di sebelah kiri/kanan yang tidak aktif */
    transform: scale(0.95);
    transition: all 0.4s ease;
}

.certificate-image.active {
    opacity: 1;
    transform: scale(1);
}

.slider-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-circle);
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: all var(--transition-fast);
}

.slider-nav-btn:hover {
    background: var(--accent-color);
}

.slider-nav-btn.prev { left: var(--space-sm); }
.slider-nav-btn.next { right: var(--space-sm); }

/* Skeleton & Empty State */
.skeleton-container {
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: var(--radius-md);
    background: var(--skeleton-base);
    overflow: hidden;
    display: none; /* Controlled via JS */
}

.skeleton-img {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--skeleton-base) 25%, var(--skeleton-highlight) 50%, var(--skeleton-base) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.empty-state {
    text-align: center;
    padding: var(--space-xl) var(--space-md);
    color: var(--text-muted);
}

.empty-state[hidden] {
    display: none;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

/* Thumbnail List */
.certificate-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.certificate-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(0, 0, 0, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    transition: all var(--transition-fast);
}

.certificate-item:hover {
    border-color: var(--accent-glow);
    background: var(--glass-bg-hover);
}

.certificate-select {
    flex: 1;
    text-align: left;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--space-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color var(--transition-fast);
}

.certificate-select.active-select {
    color: var(--accent-color);
    font-weight: 600;
}

.certificate-download {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    flex-shrink: 0;
}

.certificate-download:hover {
    background: var(--accent-color);
    color: #fff;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md) var(--space-xxl);
    text-align: center;
}

.download-container {
    margin-bottom: var(--space-xl);
}

.btn-primary-large {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    width: 100%;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    background: var(--accent-gradient);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-glow);
    transition: all var(--transition-normal);
}

.btn-primary-large:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(2, 132, 199, 0.4);
}

.btn-primary-large:active {
    transform: translateY(0);
}

.footer-copyright {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.powered-by {
    margin-top: var(--space-xs);
    font-size: 0.75rem;
    opacity: 0.7;
}

/* ==========================================================================
   Toast Notification Container
   ========================================================================== */
.toast-container {
    position: fixed;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    pointer-events: none;
    width: max-content;
    max-width: 90vw;
}

.toast {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-pill);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: var(--shadow-md);
    animation: toastSlideUp var(--transition-normal) forwards;
    pointer-events: auto;
}

.toast.success { border-bottom: 2px solid var(--success-color); }
.toast.error { border-bottom: 2px solid var(--error-color); }

/* ==========================================================================
   Animations & Keyframes
   ========================================================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
    100% { transform: translateY(0px); }
}

@keyframes shimmer {
    100% { background-position: -200% 0; }
}

@keyframes toastSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   Accessibility & Responsive Adjustments
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Desktop/Tablet Constraints */
@media (min-width: 768px) {
    :root {
        --max-width: 680px;
    }
    
    .certificate-slider-container {
        aspect-ratio: 16/9; /* Wider ratio for desktop */
    }
    
    .contact-btn {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}