/* ============================
   CSS VARIABLES & THEME SYSTEM
   ============================ */
:root {
    /* DARK THEME (default) */
    --bg-primary: #37353E;
    --bg-secondary: #44444E;
    --bg-tertiary: #715A5A;
    --bg-card: #44444E;
    --text-primary: #D3DAD9;
    --text-secondary: rgb(211, 218, 217);
    --text-muted: rgba(211, 218, 217, 0.7);
    --accent: #715A5A;
    --accent-hover: #8a7070;
    --border: rgba(211, 218, 217, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --toggle-width: 52px;
    --toggle-height: 28px;
    --toggle-padding: 3px;
    --toggle-thumb-size: 22px;
    --toggle-track: #2f2e36;
    --toggle-thumb: #f5f5f5;
    --toggle-icon: #37353E;
    --toggle-transition: 0.35s ease;
}

body.light {
    /* LIGHT THEME */
    --bg-primary: #F9F8F6;
    --bg-secondary: #EFE9E3;
    --bg-tertiary: #D9CFC7;
    --bg-card: #EFE9E3;
    --text-primary: #37353E;
    --text-secondary: #715A5A;
    --text-muted: rgba(55, 53, 62, 0.7);
    --accent: #C9B59C;
    --accent-hover: #b5a188;
    --border: rgba(55, 53, 62, 0.1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.15);
    --toggle-track: #ded5cc;
    --toggle-thumb: #37353E;
    --toggle-icon: #F9F8F6;
}

/* ============================
   UNIVERSAL RESET
   ============================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============================
   THEME TOGGLE
   ============================ */
.theme-toggle {
    width: var(--toggle-width);
    height: var(--toggle-height);
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    z-index: 100;
    display: flex;
    align-items: center;
}

.toggle-track {
    width: 100%;
    height: 100%;
    background: var(--toggle-track);
    border-radius: 999px;
    padding: var(--toggle-padding);
    display: flex;
    align-items: center;
    transition: background var(--toggle-transition);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.toggle-thumb {
    width: var(--toggle-thumb-size);
    height: var(--toggle-thumb-size);
    background: var(--toggle-thumb);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--toggle-icon);
    transition: transform var(--toggle-transition), background var(--toggle-transition), color var(--toggle-transition), box-shadow var(--toggle-transition);
    box-shadow: var(--shadow-sm);
    transform: translateX(0);
}

.toggle-thumb svg {
    width: 14px;
    height: 14px;
}

body.light .toggle-thumb {
    transform: translateX(calc(var(--toggle-width) - var(--toggle-thumb-size) - (var(--toggle-padding) * 2)));
}

/* ============================
   TYPOGRAPHY
   ============================ */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p { color: var(--text-secondary); margin-bottom: 1rem; }
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-hover); }

code, pre { font-family: 'Fira Code', monospace; }

/* ============================
   LAYOUT: MAIN GRID
   ============================ */
body {
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-rows: auto 1fr;
    min-height: 100vh;
}

/* ============================
   SIDEBAR
   ============================ */
.sidebar {
    grid-column: 1;
    grid-row: 1 / 3;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    transition: var(--transition);
    z-index: 100;
    width: 260px;
}

.sidebar.collapsed {
    width: 80px;
}

.sidebar.collapsed .nav-item span,
.sidebar.collapsed .sidebar-name {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar.collapsed .brand-icon {
    width: 50px;
    height: 50px;
}

.sidebar-toggle {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 36px;
    height: 36px;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    z-index: 10;
    box-shadow: var(--shadow-sm);
}

.sidebar-toggle:hover {
    background: var(--accent-hover);
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.sidebar-toggle svg {
    width: 20px;
    height: 20px;
    stroke: #fff;
    stroke-width: 2.5;
    transition: var(--transition);
}

.sidebar.collapsed .sidebar-toggle svg {
    transform: rotate(180deg);
}

.sidebar.collapsed .sidebar-toggle {
    right: 0.5rem;
}

.sidebar-brand {
    text-align: center;
    padding: 0 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-social {
    margin-top: auto;
    padding: 1.5rem 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: center;
    gap: 1rem;
    position: relative;
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
}

.sidebar-social:hover .social-link {
    opacity: 0.45;
    filter: blur(0.4px);
    transform: translateY(0);
}

.sidebar-social:hover .social-link:hover {
    opacity: 1;
    filter: none;
}

.sidebar.collapsed .social-link {
    width: 44px;
    margin: 0.25rem auto;
}

.social-link:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.social-link img {
    width: 20px;
    height: 20px;
    display: block;
    filter: invert(1) brightness(1.05);
    transition: var(--transition);
}

body.light .social-link img {
    filter: none;
}

.social-link:hover img {
    filter: invert(1) brightness(1.1);
}

.social-link::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 50%;
    bottom: 100%;
    transform: translate(-50%, -8px) scale(0.98);
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: 8px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease, filter 0.2s ease;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    z-index: 1000;
    filter: blur(6px);
}

.social-link:hover::after {
    opacity: 1;
    transform: translate(-50%, -12px) scale(1);
    filter: blur(0);
}

.sidebar:not(.collapsed) .sidebar-social {
    flex-direction: row;
}

.sidebar.collapsed .sidebar-social {
    flex-direction: column;
    gap: 0.5rem;
}

.brand-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center;
    border: 3px solid var(--accent);
    transition: var(--transition);
}

.brand-icon:hover {
    transform: scale(1.05);
    border-color: var(--accent-hover);
}

.sidebar-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: var(--transition);
    white-space: nowrap;
}

.nav-list {
    list-style: none;
    padding: 0 1rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    color: var(--text-secondary);
    border-radius: 12px;
    margin-bottom: 0.5rem;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.sidebar.collapsed .nav-item {
    padding: 1rem;
    justify-content: center;
}

.nav-item:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
    transform: translateX(4px);
}

.sidebar.collapsed .nav-item:hover {
    transform: scale(1.1);
}

.nav-item.active {
    background: var(--accent);
    color: #fff;
}

.nav-item span {
    transition: var(--transition);
    white-space: nowrap;
}

.nav-icon {
    width: 24px;
    height: 24px;
    min-width: 24px;
    stroke-width: 2;
}

/* Tooltip for collapsed sidebar */
.sidebar.collapsed .nav-item {
    position: relative;
}

.sidebar.collapsed .nav-item::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-left: 1rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: 8px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    z-index: 1000;
}

.sidebar.collapsed .nav-item:hover::after {
    opacity: 1;
}

/* ============================
   TOPBAR
   ============================ */
.topbar {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 1rem 2rem;
    gap: 1rem;
    z-index: 90;
    height: 70px;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    width: 24px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(8px, 8px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(7px, -7px); }

.topbar-spacer {
    flex: 1;
}

.topbar-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.icon-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

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

.icon-btn svg {
    width: 20px;
    height: 20px;
}

/* ============================
   MAIN CONTENT
   ============================ */
main {
    grid-column: 2;
    grid-row: 2;
    padding: 3rem 2rem;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.section {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

/* ============================
   ARCADE HOLD
   ============================ */
.arcade-entry {
    margin: 3rem 0;
    padding: 3rem;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.035);
    border: 1px solid var(--border);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
    position: relative;
    overflow: hidden;
}

body.light .arcade-entry {
    background: rgba(55, 53, 62, 0.03);
    box-shadow: 0 16px 30px rgba(55, 53, 62, 0.12);
}

.arcade-hold {
    display: flex;
    justify-content: center;
}

.arcade-hold-btn {
    position: relative;
    min-width: min(520px, 100%);
    padding: 1.5rem 3.75rem;
    border-radius: 18px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-primary);
    font-family: 'Poppins', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    cursor: pointer;
    transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.25s cubic-bezier(0.22, 1, 0.36, 1), background 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.22);
    display: flex;
    align-items: center;
    justify-content: center;
}

.arcade-hold-btn:hover {
    box-shadow: 0 18px 36px rgba(0, 0, 0, 0.3);
}

.arcade-hold-btn.holding {
    transform: scale(0.98);
}

.arcade-hold-btn.complete {
    transform: scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.arcade-hold-text {
    position: relative;
    z-index: 2;
    display: grid;
    place-items: center;
}

.arcade-hold-label,
.arcade-hold-enter {
    grid-area: 1 / 1;
    transition: opacity 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.arcade-hold-enter {
    opacity: 0;
}

.arcade-hold-btn.entering .arcade-hold-label {
    opacity: 0;
}

.arcade-hold-btn.entering .arcade-hold-enter {
    opacity: 1;
}

.arcade-hold-ring {
    --progress: 0;
    position: absolute;
    inset: -7px;
    border-radius: 20px;
    padding: 2px;
    background: conic-gradient(var(--text-primary) calc(var(--progress) * 1turn), transparent 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    opacity: 0.55;
}

.arcade-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 20;
}

body.arcade-transition .arcade-backdrop {
    opacity: 1;
}

@media (max-width: 640px) {
    .arcade-entry {
        padding: 2.2rem 1.5rem;
    }

    .arcade-hold-btn {
        padding: 1.1rem 2.4rem;
        font-size: 0.85rem;
        letter-spacing: 0.06em;
    }
}

@media (prefers-reduced-motion: reduce) {
    .arcade-hold-btn {
        transition: none;
    }
}

/* ============================
   GAMES PAGE FADE IN
   ============================ */
.games-fade-in {
    animation: gamesFadeIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes gamesFadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================
   TIMELINE (Learning Journey)
   ============================ */
.timeline-container {
    position: relative;
    padding: 2rem 0;
}

.timeline-line {
    position: absolute;
    left: 25px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
    border-radius: 3px;
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 3rem;
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    cursor: pointer;
}

.timeline-item:nth-child(1) { animation-delay: 0.1s; }
.timeline-item:nth-child(2) { animation-delay: 0.2s; }
.timeline-item:nth-child(3) { animation-delay: 0.3s; }
.timeline-item:nth-child(4) { animation-delay: 0.4s; }
.timeline-item:nth-child(5) { animation-delay: 0.5s; }

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

.timeline-marker {
    position: absolute;
    left: 17px;
    top: 15px;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border: 3px solid var(--bg-primary);
    border-radius: 50%;
    z-index: 2;
    transition: var(--transition);
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

.timeline-item:hover .timeline-marker {
    transform: scale(1.5);
    background: var(--accent-hover);
    box-shadow: 0 0 20px var(--accent);
}

.timeline-year {
    position: absolute;
    top: 0;
    left: 0;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    font-family: 'Poppins', sans-serif;
    background: var(--bg-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 8px 0 8px 0;
    transition: var(--transition);
    z-index: 3;
    line-height: 1;
}

.timeline-item:hover .timeline-year {
    transform: scale(1.05);
    color: var(--accent-hover);
}

.timeline-item.active .timeline-year {
    transform: scale(1.1);
    color: var(--accent-hover);
}

.timeline-content {
    background: var(--bg-card);
    padding: 1.5rem;
    padding-top: 3rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
    overflow: hidden;
    position: relative;
}

.timeline-item.expanded .timeline-content {
    max-height: 500px;
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.timeline-item.active .timeline-content {
    border-color: var(--accent);
    box-shadow: var(--shadow-lg);
    background: var(--bg-tertiary);
}

.timeline-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.timeline-desc {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================
   GRID LAYOUTS
   ============================ */
.grid {
    display: grid;
    gap: 1.5rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

/* ============================
   CARDS
   ============================ */
.card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

.card-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ============================
   SKILLS
   ============================ */
.skill-group {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.skill-group-title {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--accent);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-list li:before {
    content: "▹";
    color: var(--accent);
    font-weight: bold;
}

/* ============================
   PROJECTS
   ============================ */
.project-item {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.project-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.project-item.more-projects {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border-color: var(--accent);
}

.project-item.more-projects .project-title,
.project-item.more-projects .project-desc {
    color: #fff;
}

.project-item.more-projects .tag {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
}

.project-item.more-projects .project-link {
    color: #fff;
    font-weight: 700;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.project-title {
    font-size: 1.4rem;
    color: var(--text-primary);
}

.project-link {
    color: var(--accent);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-link:hover {
    color: var(--accent-hover);
}

.project-desc {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-family: 'Fira Code', monospace;
    border: 1px solid var(--border);
}

/* ============================
   TIC-TAC-TOE GAME
   ============================ */
.tictactoe-container {
    position: absolute;
    top: 2rem;
    right: 2rem;
    width: 200px;
    padding: 1rem;
    background: var(--bg-card);
    border: 2px dashed var(--border);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: rotate(-2deg);
    transition: transform 0.3s ease;
}

.tictactoe-container:hover {
    transform: rotate(0deg) scale(1.02);
}

.ttt-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    font-size: 0.75rem;
}

.ttt-title {
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.ttt-turn {
    color: var(--text-muted);
    font-size: 0.7rem;
}

.ttt-board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    margin-bottom: 0.75rem;
}

.ttt-cell {
    aspect-ratio: 1;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
}

.ttt-cell:hover:not(.filled) {
    background: var(--bg-tertiary);
    border-color: var(--accent);
    transform: scale(1.05);
}

.ttt-cell.filled {
    cursor: not-allowed;
    animation: popIn 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.ttt-cell.winner {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    animation: winPulse 0.6s ease infinite;
}

@keyframes popIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes winPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.ttt-reset {
    width: 100%;
    padding: 0.5rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.ttt-reset:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

@media (max-width: 1200px) {
    .tictactoe-container {
        position: static;
        width: 100%;
        max-width: 300px;
        margin: 0 auto 2rem;
        transform: rotate(0deg);
    }
}

@media (max-width: 768px) {
    .tictactoe-container {
        max-width: 250px;
    }
}

/* ============================
   GAMES
   ============================ */
.games-container {
    margin-top: 2rem;
}

.game-card {
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.game-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.game-card-image {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    overflow: hidden;
    position: relative;
}

.game-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: var(--transition);
}

.game-card:hover .game-card-image img {
    transform: scale(1.05);
}

.game-card-content {
    padding: 1.5rem;
}

.game-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.game-card-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.btn-play {
    width: 100%;
    padding: 0.75rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-play:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

/* ============================
   MODALS
   ============================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 16px;
    max-width: 1200px;
    width: 90%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: modalSlideUp 0.3s ease;
}

@keyframes modalSlideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

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

.modal-title {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.modal-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--bg-tertiary);
}

.modal-close svg {
    width: 24px;
    height: 24px;
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    position: relative;
}

#game-iframe {
    width: 100%;
    height: 600px;
    border: none;
}

.modal-controls {
    display: flex;
    gap: 1rem;
    padding: 1rem 2rem;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    align-items: center;
}

.control-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.control-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.control-btn svg {
    width: 18px;
    height: 18px;
}

.modal-spacer {
    flex: 1;
}

.modal-info {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ============================
   CV MODAL
   ============================ */
.cv-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.cv-modal.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.cv-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(8px);
}

.cv-modal-container {
    position: relative;
    width: 95%;
    height: 95%;
    max-width: 1400px;
    background: var(--bg-secondary);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.cv-close-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
}

.cv-close-btn:hover {
    background: var(--accent);
    border-color: var(--accent);
    transform: rotate(90deg) scale(1.1);
}

.cv-close-btn svg {
    width: 24px;
    height: 24px;
}

.cv-iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: #1a1a1a;
}

@media (max-width: 768px) {
    .cv-modal-container {
        width: 100%;
        height: 100%;
        border-radius: 0;
    }
}

/* ============================
   SIDEBAR OVERLAY (Mobile)
   ============================ */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* ============================
   FOOTER
   ============================ */
footer {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

footer a {
    color: var(--accent);
    font-weight: 600;
}

/* ============================
   RESPONSIVE DESIGN
   ============================ */
@media (max-width: 768px) {
    body {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        height: 100vh;
        width: 260px;
        z-index: 100;
    }

    .sidebar.active {
        left: 0;
    }

    .topbar {
        grid-column: 1;
    }

    .hamburger {
        display: flex;
    }

    main {
        grid-column: 1;
        padding: 2rem 1rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-line {
        left: 20px;
    }

    .timeline-marker {
        left: 13px;
    }

    .timeline-year {
        font-size: 1.2rem;
        padding: 0.4rem 0.6rem;
    }

    .games-teaser-title {
        font-size: 2rem;
    }

    .games-teaser-subtitle {
        font-size: 1rem;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .topbar {
        padding: 1rem;
    }

    .topbar-actions {
        gap: 0.5rem;
    }

    .icon-btn {
        width: 40px;
        height: 40px;
    }

    .modal-content {
        width: 95%;
        max-height: 95vh;
    }

    .modal-controls {
        flex-wrap: wrap;
        padding: 1rem;
    }

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

    #game-iframe {
        height: 400px;
    }
}