/* ===== CSS Variables ===== */
:root {
    --bg-color: #FFF8E7;
    --bg-gradient-1: #FFEDD5;
    --bg-gradient-2: #FEE2E2;
    --primary-color: #E75480;
    --primary-hover: #D63D6A;
    --card-bg: #FFFFFF;
    --card-border: #FFD1DC;
    --card-back-color: #4ECDC4;
    --card-back-dark: #3DB8B0;
    --text-dark: #4A2C3D;
    --text-muted: #8B5A6F;
    --shadow-card:
        0 2px 4px rgba(0, 0, 0, 0.05),
        0 4px 8px rgba(0, 0, 0, 0.05),
        0 8px 16px rgba(0, 0, 0, 0.05),
        0 16px 32px rgba(0, 0, 0, 0.08);
    --shadow-card-hover:
        0 4px 8px rgba(0, 0, 0, 0.08),
        0 8px 16px rgba(0, 0, 0, 0.08),
        0 16px 32px rgba(0, 0, 0, 0.08),
        0 24px 48px rgba(0, 0, 0, 0.1);
    --shadow-btn: 0 4px 15px rgba(231, 84, 128, 0.4);
    --border-radius-card: 16px;
    --border-radius-btn: 12px;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-gradient-1) 50%, var(--bg-gradient-2) 100%);
    color: var(--text-dark);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background-attachment: fixed;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 25px;
}

/* ===== Header ===== */
.header {
    text-align: center;
    animation: fadeInDown 0.8s ease-out;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.logo-img {
    width: 50px;
    height: 50px;
    object-fit: contain;
    animation: float 3s ease-in-out infinite;
}

.logo {
    font-family: 'Chewy', cursive;
    font-size: 2.2rem;
    font-weight: 400;
    color: var(--primary-color);
    letter-spacing: 1px;
    text-shadow: 2px 2px 0px rgba(231, 84, 128, 0.2);
}

.tagline {
    font-family: 'Nunito', sans-serif;
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 600;
}

.how-to-play-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
    padding: 16px 36px;
    background: linear-gradient(135deg, #aaa 0%, #888 100%);
    color: white;
    text-decoration: none;
    font-family: 'Chewy', cursive;
    font-size: 1.2rem;
    font-weight: 400;
    letter-spacing: 0.5px;
    border: none;
    border-radius: var(--border-radius-btn);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.how-to-play-link:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, #F06292 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn);
}

/* LDR Mode Link */
.ldr-mode-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
    margin-left: 10px;
    padding: 16px 36px;
    background: linear-gradient(135deg, #4ECDC4 0%, #3DB8B0 100%);
    color: white;
    text-decoration: none;
    font-family: 'Chewy', cursive;
    font-size: 1.2rem;
    font-weight: 400;
    letter-spacing: 0.5px;
    border: none;
    border-radius: var(--border-radius-btn);
    box-shadow: 0 4px 15px rgba(78, 205, 196, 0.4);
    transition: var(--transition);
}

.ldr-mode-link:hover {
    background: linear-gradient(135deg, #3DB8B0 0%, #2FA89F 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(78, 205, 196, 0.5);
}

/* ===== Screens ===== */
.screen {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    animation: fadeIn 0.5s ease-out;
}

.screen.hidden {
    display: none;
}

.screen-title {
    text-align: center;
}

.screen-title h2 {
    font-family: 'Chewy', cursive;
    font-size: 1.6rem;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.screen-title p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== Category Grid ===== */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 15px;
    width: 100%;
    max-width: 600px;
}

.category-card {
    background: var(--card-bg);
    border: 3px solid rgba(139, 90, 111, 0.15);
    border-radius: var(--border-radius-card);
    padding: 20px 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.category-card.selected {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #FFF0F5 0%, #FFE4EC 100%);
    box-shadow: 0 0 0 4px rgba(231, 84, 128, 0.2);
}

.category-card.selected .category-check {
    opacity: 1;
    transform: scale(1);
}

.category-emoji {
    font-size: 2rem;
}

.category-name {
    font-family: 'Chewy', cursive;
    font-size: 1.1rem;
    color: var(--text-dark);
}

.category-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

.category-check {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    opacity: 0;
    transform: scale(0);
    transition: var(--transition);
}

/* ===== Start Button ===== */
.btn-start {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 36px;
    background: linear-gradient(135deg, #aaa 0%, #888 100%);
    color: white;
    font-family: 'Chewy', cursive;
    font-size: 1.2rem;
    font-weight: 400;
    letter-spacing: 0.5px;
    border: none;
    border-radius: var(--border-radius-btn);
    cursor: not-allowed;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    margin-top: 10px;
}

.btn-start.ready {
    background: linear-gradient(135deg, var(--primary-color) 0%, #F06292 100%);
    cursor: pointer;
    box-shadow: var(--shadow-btn);
}

.btn-start.ready:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(231, 84, 128, 0.5);
}

.selected-badge {
    font-family: 'Nunito', sans-serif;
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ===== Game Header ===== */
.game-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    border-radius: var(--border-radius-card);
    padding: 15px 20px;
    box-shadow: var(--shadow-card);
}

.game-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: 8px;
    font-family: 'Nunito', sans-serif;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.reset-btn {
    background: transparent;
    color: var(--text-muted);
}

.reset-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-dark);
}

.finish-btn {
    background: rgba(231, 84, 128, 0.1);
    color: var(--primary-color);
}

.finish-btn:hover {
    background: rgba(231, 84, 128, 0.2);
}

.round-info {
    font-family: 'Chewy', cursive;
    font-size: 1.1rem;
    color: var(--text-dark);
}

.round-info span {
    color: var(--primary-color);
}

/* ===== Game Instruction ===== */
.game-instruction {
    color: var(--text-muted);
    font-size: 0.95rem;
    text-align: center;
}

/* ===== 5 Cards Row ===== */
.cards-row {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
    perspective: 1000px;
}

/* ===== Flip Card ===== */
.flip-card {
    width: 140px;
    height: 200px;
    perspective: 1000px;
    cursor: pointer;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-back,
.flip-card-front {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: var(--border-radius-card);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 15px;
}

/* Card Back (closed) */
.flip-card-back {
    background: linear-gradient(135deg, var(--card-back-color) 0%, var(--card-back-dark) 100%);
    border: 4px solid #FFD93D;
    box-shadow:
        0 4px 15px rgba(78, 205, 196, 0.4),
        inset 0 2px 10px rgba(255, 255, 255, 0.2);
}

.flip-card:hover .flip-card-back {
    transform: translateY(-5px);
    box-shadow:
        0 8px 25px rgba(78, 205, 196, 0.5),
        inset 0 2px 10px rgba(255, 255, 255, 0.2);
}

.card-deck-icon {
    font-size: 3rem;
    animation: float 2s ease-in-out infinite;
}

/* Card Front (revealed) */
.flip-card-front {
    background: linear-gradient(145deg, #ffffff 0%, #fefefe 50%, #fafafa 100%);
    border: 3px solid var(--card-border);
    transform: rotateY(180deg);
    box-shadow: var(--shadow-card);
}

.front-category {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
    text-align: center;
}

.front-question {
    font-size: 0.85rem;
    color: var(--text-dark);
    text-align: center;
    line-height: 1.5;
}

/* ===== Question Display ===== */
.question-display {
    width: 100%;
    max-width: 500px;
    background: var(--card-bg);
    border-radius: var(--border-radius-card);
    padding: 25px;
    box-shadow: var(--shadow-card-hover);
    animation: scaleIn 0.3s ease-out;
    border: 3px solid var(--card-border);
}

.question-display.hidden {
    display: none;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.question-category {
    font-size: 0.95rem;
    color: var(--primary-color);
    font-weight: 600;
}

.close-btn {
    width: 30px;
    height: 30px;
    border: none;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 50%;
    font-size: 1.2rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-dark);
}

.question-text {
    font-size: 1.3rem;
    font-weight: 500;
    line-height: 1.7;
    text-align: center;
    color: var(--text-dark);
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.contact-link a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.contact-link a:hover {
    text-decoration: underline;
}

/* ===== Animations ===== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes float {

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

    50% {
        transform: translateY(-8px);
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 600px) {
    body {
        padding: 15px;
    }

    .container {
        gap: 20px;
    }

    .logo {
        font-size: 1.6rem;
    }

    .category-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .category-card {
        padding: 15px 10px;
    }

    .category-emoji {
        font-size: 1.6rem;
    }

    .category-name {
        font-size: 0.95rem;
    }

    .flip-card {
        width: 100px;
        height: 150px;
    }

    .card-deck-icon {
        font-size: 2rem;
    }

    .front-category {
        font-size: 0.7rem;
    }

    .front-question {
        font-size: 0.7rem;
    }

    .game-header {
        padding: 12px 15px;
    }

    .game-btn {
        padding: 8px 12px;
        font-size: 0.8rem;
    }

    .question-text {
        font-size: 1.1rem;
    }

    .btn-start {
        padding: 14px 28px;
        font-size: 1rem;
    }

    .logo-img {
        width: 40px;
        height: 40px;
    }

    .how-to-play-link {
        padding: 12px 24px;
        font-size: 1rem;
    }

    .ldr-mode-link {
        padding: 12px 24px;
        font-size: 1rem;
        margin-left: 0;
    }
}

@media (max-width: 400px) {
    .flip-card {
        width: 85px;
        height: 130px;
    }

    .cards-row {
        gap: 8px;
    }
}

@media (min-width: 768px) {
    .container {
        max-width: 800px;
    }

    .logo {
        font-size: 2.4rem;
    }

    .category-grid {
        grid-template-columns: repeat(5, 1fr);
    }

    .flip-card {
        width: 130px;
        height: 190px;
    }

    .front-question {
        font-size: 0.9rem;
    }
}

/* ===== Focus States for Accessibility ===== */
.btn-start:focus,
.game-btn:focus,
.category-card:focus {
    outline: 3px solid rgba(231, 84, 128, 0.5);
    outline-offset: 3px;
}

.btn-start:focus:not(:focus-visible),
.game-btn:focus:not(:focus-visible),
.category-card:focus:not(:focus-visible) {
    outline: none;
}