/* ===== BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #00d4ff;
    --secondary: #7c3aed;
    --accent: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.8);
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --code-bg: #1e293b;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1e1b4b 50%, #0f172a 100%);
    color: var(--text);
    min-height: 100vh;
    overflow: hidden;
}

/* ===== PRESENTATION CONTAINER ===== */
.presentation {
    width: 100vw;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

/* ===== SLIDE STYLES ===== */
.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    padding: 60px 80px;
    display: none;
    flex-direction: column;
    opacity: 0;
    transform: translateX(100px);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
}

.slide.active {
    display: flex;
    opacity: 1;
    transform: translateX(0);
}

.slide-content {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* ===== TITLE SLIDE ===== */
.title-slide {
    justify-content: center;
    align-items: center;
    text-align: center;
    background: radial-gradient(ellipse at center, rgba(124, 58, 237, 0.2) 0%, transparent 70%);
}

.title-slide h1 {
    font-size: 4rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    animation: glow 2s ease-in-out infinite alternate;
}

.title-slide .subtitle {
    font-size: 1.8rem;
    color: var(--text-muted);
    margin-bottom: 40px;
}

.title-slide .module-badge {
    display: inline-block;
    padding: 12px 30px;
    background: var(--bg-card);
    border: 1px solid var(--primary);
    border-radius: 50px;
    font-size: 1.2rem;
    backdrop-filter: blur(10px);
}

@keyframes glow {
    from {
        text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    }

    to {
        text-shadow: 0 0 40px rgba(124, 58, 237, 0.5);
    }
}

/* ===== TITLE LOGO ===== */
.title-logo {
    width: 120px;
    height: auto;
    margin-bottom: 30px;
    animation: float 3s ease-in-out infinite, pulse 2s ease-in-out infinite;
    filter: drop-shadow(0 10px 30px rgba(0, 212, 255, 0.4));
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-15px);
    }
}

@keyframes pulse {

    0%,
    100% {
        filter: drop-shadow(0 10px 30px rgba(0, 212, 255, 0.4));
    }

    50% {
        filter: drop-shadow(0 15px 40px rgba(124, 58, 237, 0.6));
    }
}

/* ===== FLOATING DART DECORATIONS ===== */
.dart-decoration {
    position: fixed;
    z-index: 1;
    opacity: 0.1;
    pointer-events: none;
}

.dart-decoration img {
    width: 100%;
    height: auto;
}

.dart-deco-1 {
    width: 200px;
    top: 10%;
    right: 5%;
    animation: floatSlow 8s ease-in-out infinite;
}

.dart-deco-2 {
    width: 150px;
    bottom: 20%;
    left: 3%;
    animation: floatSlow 10s ease-in-out infinite reverse;
}

.dart-deco-3 {
    width: 100px;
    top: 50%;
    right: 2%;
    animation: floatSlow 6s ease-in-out infinite;
}

@keyframes floatSlow {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-30px) rotate(10deg);
    }
}

/* ===== SECTION HEADERS ===== */
.section-slide {
    justify-content: center;
    align-items: center;
    text-align: center;
}

.section-number {
    font-size: 8rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.section-title {
    font-size: 3rem;
    margin-top: 20px;
    color: var(--text);
}

.section-subtitle {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-top: 15px;
}

/* ===== CONTENT SLIDES ===== */
h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 15px;
}

h2 .icon {
    font-size: 2rem;
}

h3 {
    font-size: 1.6rem;
    color: var(--accent);
    margin: 25px 0 15px;
}

p {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text);
    margin-bottom: 15px;
}

ul,
ol {
    padding-left: 30px;
    margin: 15px 0;
}

li {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 10px;
    color: var(--text);
}

li::marker {
    color: var(--primary);
}

/* ===== CODE BLOCKS ===== */
.code-block {
    background: var(--code-bg);
    border-radius: 12px;
    padding: 20px 25px;
    margin: 20px 0;
    overflow-x: auto;
    border: 1px solid rgba(0, 212, 255, 0.2);
    position: relative;
}

.code-block::before {
    content: 'Dart';
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(0, 212, 255, 0.1);
    padding: 3px 10px;
    border-radius: 4px;
}

.code-block code {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 1rem;
    line-height: 1.6;
    color: #e2e8f0;
    white-space: pre;
}

/* Syntax Highlighting */
.keyword {
    color: #c792ea;
}

.type {
    color: #82aaff;
}

.string {
    color: #c3e88d;
}

.number {
    color: #f78c6c;
}

.comment {
    color: #546e7a;
    font-style: italic;
}

.function {
    color: #82aaff;
}

.variable {
    color: #f07178;
}

.operator {
    color: #89ddff;
}

.bool {
    color: #f78c6c;
}

/* ===== INFO BOXES ===== */
.info-box {
    padding: 20px 25px;
    border-radius: 12px;
    margin: 20px 0;
    border-left: 4px solid;
}

.info-box.tip {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--success);
}

.info-box.warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--warning);
}

.info-box.important {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--primary);
}

.info-box-title {
    font-weight: 700;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ===== CARDS ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 25px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.card h4 {
    font-size: 1.3rem;
    color: var(--primary);
    margin-bottom: 10px;
}

.card p {
    font-size: 1rem;
    color: var(--text-muted);
}

/* ===== COMPARISON TABLE ===== */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 1.1rem;
}

.comparison-table th,
.comparison-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.comparison-table th {
    background: rgba(124, 58, 237, 0.2);
    color: var(--primary);
    font-weight: 600;
}

.comparison-table tr:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* ===== NAVIGATION ===== */
.nav-controls {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 20px;
    z-index: 1000;
    background: var(--bg-card);
    padding: 15px 30px;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.nav-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
}

.slide-counter {
    font-size: 1.1rem;
    color: var(--text);
    min-width: 80px;
    text-align: center;
}

/* ===== PROGRESS BAR ===== */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.3s;
    z-index: 1000;
}

/* ===== TWO COLUMN LAYOUT ===== */
.two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin: 20px 0;
}

.column {
    flex: 1;
}

/* ===== ANALOGY BOX ===== */
.analogy-box {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.2), rgba(0, 212, 255, 0.1));
    border-radius: 16px;
    padding: 28px;
    margin: 20px 0;
    border: 1px solid rgba(124, 58, 237, 0.3);
    position: relative;
    overflow: hidden;
}

.analogy-box::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 20%, rgba(0, 212, 255, 0.18), transparent 26%),
        radial-gradient(circle at 82% 15%, rgba(124, 58, 237, 0.18), transparent 28%);
    pointer-events: none;
}

.analogy-box .emoji {
    font-size: 3rem;
    margin-bottom: 15px;
}

.analogy-box > * {
    position: relative;
    z-index: 1;
}

.variable-visual {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 28px;
    align-items: center;
    margin-bottom: 18px;
}

.storage-box {
    position: relative;
    width: 210px;
    height: 170px;
    margin: 0 auto;
    perspective: 700px;
    animation: boxFloat 3.4s ease-in-out infinite;
}

.box-lid {
    position: absolute;
    left: 28px;
    top: 8px;
    width: 154px;
    height: 44px;
    border-radius: 10px 10px 4px 4px;
    background: linear-gradient(135deg, #7c3aed, #00d4ff);
    transform: rotateX(58deg) translateY(4px);
    transform-origin: bottom;
    box-shadow: 0 14px 28px rgba(0, 212, 255, 0.22);
    animation: lidOpen 2.8s ease-in-out infinite;
}

.box-face {
    position: absolute;
    left: 18px;
    top: 48px;
    width: 174px;
    min-height: 100px;
    display: grid;
    place-items: center;
    gap: 6px;
    padding: 18px;
    border: 2px solid rgba(255, 255, 255, 0.16);
    border-radius: 16px;
    background:
        linear-gradient(160deg, rgba(0, 212, 255, 0.28), rgba(124, 58, 237, 0.44)),
        rgba(30, 41, 59, 0.95);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.18),
        0 22px 40px rgba(0, 0, 0, 0.32);
}

.box-face::before,
.box-face::after {
    content: "";
    position: absolute;
    top: 14px;
    bottom: 14px;
    width: 2px;
    background: rgba(255, 255, 255, 0.12);
}

.box-face::before {
    left: 18px;
}

.box-face::after {
    right: 18px;
}

.box-label {
    padding: 5px 12px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.76);
    color: #93c5fd;
    font-family: "Courier New", monospace;
    font-weight: 700;
}

.box-value {
    color: white;
    font-size: 1.55rem;
    font-weight: 800;
    text-shadow: 0 0 24px rgba(0, 212, 255, 0.55);
    animation: valuePulse 1.8s ease-in-out infinite;
}

.box-shadow {
    position: absolute;
    left: 34px;
    right: 34px;
    bottom: 0;
    height: 22px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.34);
    filter: blur(12px);
}

.variable-parts {
    display: grid;
    gap: 12px;
}

.variable-parts div {
    padding: 14px 16px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    background: rgba(15, 23, 42, 0.52);
    animation: partSlideIn 0.7s ease both;
}

.variable-parts div:nth-child(2) {
    animation-delay: 0.15s;
}

.variable-parts div:nth-child(3) {
    animation-delay: 0.3s;
}

.variable-parts strong,
.variable-parts span {
    display: block;
}

.variable-parts strong {
    color: var(--primary);
    margin-bottom: 3px;
}

.variable-parts span {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.variable-box-grid {
    grid-template-columns: repeat(4, 1fr);
}

.variable-box-card {
    text-align: center;
    position: relative;
    overflow: hidden;
    animation: cardPop 0.65s ease both;
}

.variable-box-card:nth-child(2) {
    animation-delay: 0.1s;
}

.variable-box-card:nth-child(3) {
    animation-delay: 0.2s;
}

.variable-box-card:nth-child(4) {
    animation-delay: 0.3s;
}

.variable-box-card:hover .box-mini {
    transform: translateY(-8px) rotate(-2deg) scale(1.06);
}

.box-mini {
    width: min(130px, 100%);
    min-height: 72px;
    display: grid;
    place-items: center;
    margin: 0 auto 16px;
    border-radius: 14px;
    color: white;
    font-family: "Courier New", monospace;
    font-size: 1.25rem;
    font-weight: 800;
    border: 2px solid rgba(255, 255, 255, 0.18);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.22),
        0 14px 30px rgba(0, 0, 0, 0.26);
    transition: transform 0.3s ease;
}

.string-box {
    background: linear-gradient(135deg, #06b6d4, #2563eb);
}

.number-box {
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
}

.decimal-box {
    background: linear-gradient(135deg, #14b8a6, #22c55e);
}

.bool-box {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
}

.naming-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 28px 0;
}

.naming-card {
    padding: 22px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 18px;
    background: rgba(30, 41, 59, 0.78);
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.22);
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.naming-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
}

.naming-card.recommended {
    border-color: rgba(16, 185, 129, 0.45);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.16), rgba(30, 41, 59, 0.82));
}

.naming-card.avoid {
    border-color: rgba(239, 68, 68, 0.45);
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.14), rgba(30, 41, 59, 0.82));
}

.naming-label {
    margin-bottom: 14px;
    color: var(--primary);
    font-weight: 800;
}

.naming-card code {
    display: block;
    margin: 8px 0;
    padding: 10px 12px;
    border-radius: 10px;
    background: rgba(15, 23, 42, 0.78);
    color: #e0f2fe;
    font-size: 1.05rem;
}

.naming-card p {
    margin-top: 14px;
    color: var(--text-muted);
}

@keyframes boxFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes lidOpen {
    0%, 100% { transform: rotateX(58deg) translateY(4px); }
    50% { transform: rotateX(45deg) translateY(-4px); }
}

@keyframes valuePulse {
    0%, 100% { transform: scale(1); opacity: 0.9; }
    50% { transform: scale(1.08); opacity: 1; }
}

@keyframes partSlideIn {
    from { opacity: 0; transform: translateX(22px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes cardPop {
    from { opacity: 0; transform: translateY(18px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .slide {
        padding: 40px 50px;
    }

    .title-slide h1 {
        font-size: 3rem;
    }

    h2 {
        font-size: 2rem;
    }

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

    .variable-visual {
        grid-template-columns: 1fr;
    }

    .variable-box-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .slide {
        padding: 30px;
    }

    .title-slide h1 {
        font-size: 2.5rem;
    }

    .section-number {
        font-size: 5rem;
    }

    .nav-controls {
        padding: 10px 20px;
        gap: 15px;
    }

    .nav-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }

    .variable-box-grid {
        grid-template-columns: 1fr;
    }
}