:root {
    --bg-main: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --card-border: #e2e8f0;
    --border-light: #f1f5f9;
    --border-medium: #e2e8f0;
    --radio-border: #cbd5e1;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
    --btn-primary-bg: #1e293b;
    --btn-primary-text: #ffffff;
    --logo-gradient: linear-gradient(135deg, #1e293b 0%, #475569 100%);
    
    --block-blue-bg: #eef2ff;
    --block-blue-text: #4f46e5;
    --block-orange-bg: #fff7ed;
    --block-orange-text: #ea580c;
    --block-green-bg: #f0fdf4;
    --block-green-text: #16a34a;
    --block-pink-bg: #fdf2f8;
    --block-pink-text: #db2777;
    --block-purple-bg: #f5f3ff;
    --block-purple-text: #9333ea;
    
    --correct: #10b981;
    --wrong: #ec4899;
    --correct-bg: rgba(16, 185, 129, 0.05);
    --wrong-bg: rgba(236, 72, 153, 0.05);
}

[data-theme="dark"] {
    --bg-main: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --card-bg: #1e293b;
    --card-border: rgba(255, 255, 255, 0.05);
    --border-light: #334155;
    --border-medium: #475569;
    --radio-border: #64748b;
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
    --btn-primary-bg: #3b82f6;
    --btn-primary-text: #ffffff;
    --logo-gradient: linear-gradient(135deg, #f8fafc 0%, #94a3b8 100%);
    
    --block-blue-bg: rgba(79, 70, 229, 0.2);
    --block-blue-text: #818cf8;
    --block-orange-bg: rgba(234, 88, 12, 0.2);
    --block-orange-text: #fb923c;
    --block-green-bg: rgba(22, 163, 74, 0.2);
    --block-green-text: #4ade80;
    --block-pink-bg: rgba(219, 39, 119, 0.2);
    --block-pink-text: #f472b6;
    --block-purple-bg: rgba(147, 51, 234, 0.2);
    --block-purple-text: #c084fc;
    
    --correct: #34d399;
    --wrong: #f472b6;
    --correct-bg: rgba(52, 211, 153, 0.1);
    --wrong-bg: rgba(244, 114, 182, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s ease, color 0.3s ease;
    animation: smoothPageLoad 0.4s ease-out forwards;
}

@keyframes smoothPageLoad {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

.container {
    max-width: 480px;
    margin: 0 auto;
    min-height: 100vh;
    background: transparent; /* Теперь карточки "парят" на фоне */
}

/* ========== Header ========== */
.header {
    background: transparent;
    padding: 40px 20px 20px 20px;
    text-align: center;
    position: relative;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    transition: transform 0.2s;
}

.theme-toggle:active {
    transform: scale(0.9);
}

.logo {
    font-size: 32px;
    font-weight: 800;
    background: var(--logo-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 8px;
    font-weight: 500;
}

/* ========== Blocks (Cards) ========== */
.blocks {
    padding: 0 20px 20px 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.block {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 24px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--card-border);
    position: relative;
    overflow: hidden;
}

.block:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.block:active {
    transform: translateY(0) scale(0.98);
}

/* Block Content Structure */
.block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.block-chapters {
    font-size: 18px;
    font-weight: 700;
}

.block-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.block-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-main);
    letter-spacing: -0.3px;
}

.block-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
    font-weight: 500;
}

.block-button {
    border: none;
    padding: 14px 24px;
    border-radius: 14px;
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.block-button:hover {
    transform: translateY(-2px);
}

/* ========== Block Colors (Accents only) ========== */

/* BLUE */
.block-blue .block-chapters { color: var(--block-blue-text); }
.block-blue .block-badge { background: var(--block-blue-bg); color: var(--block-blue-text); }
.block-blue .block-button { background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%); }
.block-blue .block-button:hover { box-shadow: 0 6px 15px rgba(59, 130, 246, 0.3); }

/* YELLOW */
.block-yellow .block-chapters { color: var(--block-orange-text); }
.block-yellow .block-badge { background: var(--block-orange-bg); color: var(--block-orange-text); }
.block-yellow .block-button { background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%); }
.block-yellow .block-button:hover { box-shadow: 0 6px 15px rgba(245, 158, 11, 0.3); }

/* PURPLE */
.block-purple .block-chapters { color: var(--block-purple-text); }
.block-purple .block-badge { background: var(--block-purple-bg); color: var(--block-purple-text); }
.block-purple .block-button { background: linear-gradient(135deg, #8b5cf6 0%, #a78bfa 100%); }
.block-purple .block-button:hover { box-shadow: 0 6px 15px rgba(139, 92, 246, 0.3); }

/* GREEN */
.block-green .block-chapters { color: var(--block-green-text); }
.block-green .block-badge { background: var(--block-green-bg); color: var(--block-green-text); }
.block-green .block-button { background: linear-gradient(135deg, #10b981 0%, #34d399 100%); }
.block-green .block-button:hover { box-shadow: 0 6px 15px rgba(16, 185, 129, 0.3); }

/* PINK */
.block-pink .block-chapters { color: var(--block-pink-text); }
.block-pink .block-badge { background: var(--block-pink-bg); color: var(--block-pink-text); }
.block-pink .block-button { background: linear-gradient(135deg, #ec4899 0%, #f472b6 100%); }
.block-pink .block-button:hover { box-shadow: 0 6px 15px rgba(236, 72, 153, 0.3); }

/* ========== Footer ========== */
.footer {
    padding: 20px;
    text-align: center;
    font-size: 13px;
    color: #94a3b8;
    margin-bottom: 20px;
}

.disclaimer {
    font-size: 11px;
    line-height: 1.6;
    color: #94a3b8;
    text-align: left;
    background: rgba(0, 0, 0, 0.03);
    padding: 16px;
    border-radius: 14px;
    margin-top: 25px;
    border: 1px solid rgba(0, 0, 0, 0.02);
}

/* ========== Responsive ========== */
@media (max-width: 360px) {
    .logo {
        font-size: 26px;
    }

    .block-title {
        font-size: 20px;
    }
}

/* ========== Global Utilities ========== */
.header-icon-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    color: var(--text-muted);
    transition: transform 0.2s, filter 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-icon-btn:hover {
    transform: scale(1.1);
    filter: brightness(1.2);
}

/* ========== Global Modals (Settings & Notes) ========== */
.kiip-modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: flex-end;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.kiip-modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.kiip-modal-content, .kiip-notes-content {
    background: var(--card-bg);
    width: 100%;
    max-width: 600px;
    border-radius: 24px 24px 0 0;
    padding: 24px;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.1);
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.kiip-notes-content {
    height: 70vh;
}

.kiip-modal-overlay.active .kiip-modal-content,
.kiip-modal-overlay.active .kiip-notes-content {
    transform: translateY(0);
}

.kiip-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.kiip-modal-header h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
    margin: 0;
}

.kiip-modal-close {
    background: var(--bg-main);
    border: none;
    width: 32px; height: 32px;
    border-radius: 50%;
    font-size: 20px;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.kiip-setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--bg-main);
    border-radius: 16px;
    font-weight: 600;
    color: var(--text-main);
}

/* Toggle Switch */
.kiip-theme-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 28px;
    margin: 0 12px;
}
.kiip-theme-switch input { opacity: 0; width: 0; height: 0; }
.kiip-slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--text-muted);
    transition: .4s;
    border-radius: 34px;
}
.kiip-slider:before {
    position: absolute;
    content: "";
    height: 20px; width: 20px;
    left: 4px; bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .kiip-slider { background-color: #3b82f6; }
input:checked + .kiip-slider:before { transform: translateX(22px); }

/* Notes Textarea */
.kiip-notes-body {
    flex: 1;
    display: flex;
    flex-direction: column;
}
#globalNotesText {
    flex: 1;
    width: 100%;
    border: none;
    resize: none;
    background: var(--bg-main);
    border-radius: 16px;
    padding: 16px;
    font-size: 16px;
    color: var(--text-main);
    font-family: inherit;
    line-height: 1.5;
}
#globalNotesText:focus {
    outline: 2px solid #3b82f6;
}