/**
 * Neon Dark Mode Styles
 * TOEIC Vocabulary List - UI v1
 * ネオン風ダークモード
 */

/* ==================== Neon Dark Mode Theme Variables ==================== */

body.neon-mode {
    /* Neon Color Palette */
    --neon-cyan: #00f0ff;
    --neon-magenta: #ff006e;
    --neon-purple: #b026ff;
    --neon-pink: #ff10f0;
    --neon-green: #39ff14;
    --neon-blue: #00d4ff;
    --neon-orange: #ff6b00;

    /* Colors - Background (very dark) */
    --color-bg-page: #0a0a0a;
    --color-bg-card: #1a1a1a;
    --color-bg-header: #000000;
    --color-bg-footer: #000000;

    /* Colors - Text (bright for contrast) */
    --color-text-primary: #ffffff;
    --color-text-secondary: #e0e0e0;
    --color-text-light: #b0b0b0;
    --color-text-inverse: #000000;

    /* Colors - Border (neon glow) */
    --color-border: rgba(0, 240, 255, 0.3);
    --color-border-hover: rgba(0, 240, 255, 0.6);

    /* Primary color override for neon theme */
    --color-primary: var(--neon-cyan);
    --color-primary-dark: #00d4ff;
    --color-primary-light: #00f0ff;

    /* Neon Glow Shadows */
    --glow-cyan: 0 0 5px var(--neon-cyan),
                 0 0 10px var(--neon-cyan),
                 0 0 20px var(--neon-cyan),
                 0 0 30px var(--neon-cyan);

    --glow-cyan-strong: 0 0 5px var(--neon-cyan),
                        0 0 15px var(--neon-cyan),
                        0 0 30px var(--neon-cyan),
                        0 0 45px var(--neon-cyan),
                        0 0 60px var(--neon-cyan);

    --glow-magenta: 0 0 5px var(--neon-magenta),
                    0 0 10px var(--neon-magenta),
                    0 0 20px var(--neon-magenta),
                    0 0 30px var(--neon-magenta);

    --glow-purple: 0 0 5px var(--neon-purple),
                   0 0 10px var(--neon-purple),
                   0 0 20px var(--neon-purple),
                   0 0 30px var(--neon-purple);

    --glow-green: 0 0 5px var(--neon-green),
                  0 0 10px var(--neon-green),
                  0 0 20px var(--neon-green),
                  0 0 30px var(--neon-green);

    --text-glow-cyan: 0 0 5px var(--neon-cyan),
                      0 0 10px var(--neon-cyan),
                      0 0 15px var(--neon-cyan);

    --text-glow-magenta: 0 0 5px var(--neon-magenta),
                         0 0 10px var(--neon-magenta),
                         0 0 15px var(--neon-magenta);
}

/* ==================== Neon Animations ==================== */

@keyframes neonPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.85;
    }
}

@keyframes neonFlicker {
    0%, 100% {
        opacity: 1;
    }
    45% {
        opacity: 0.98;
    }
    50% {
        opacity: 0.95;
    }
    55% {
        opacity: 1;
    }
}

/* ==================== Header Elements ==================== */

body.neon-mode .header {
    background-color: var(--color-bg-header);
    border-bottom: 2px solid var(--neon-cyan);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

body.neon-mode .title {
    color: var(--neon-cyan);
    text-shadow: var(--text-glow-cyan);
    animation: neonFlicker 8s infinite;
}

body.neon-mode .subtitle {
    color: var(--neon-purple);
    text-shadow: 0 0 10px var(--neon-purple);
}

/* ==================== Level and Display Mode Buttons ==================== */

body.neon-mode .level-btn,
body.neon-mode .display-mode-btn {
    background-color: transparent;
    color: var(--neon-cyan);
    border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    text-shadow: 0 0 5px var(--neon-cyan);
}

body.neon-mode .level-btn:hover,
body.neon-mode .display-mode-btn:hover {
    border-color: var(--neon-cyan);
    color: var(--neon-cyan);
    background-color: rgba(0, 240, 255, 0.1);
    box-shadow: var(--glow-cyan);
}

body.neon-mode .level-btn.active,
body.neon-mode .display-mode-btn.active {
    background-color: var(--neon-cyan);
    border-color: var(--neon-cyan);
    color: #000000;
    box-shadow: var(--glow-cyan-strong);
    font-weight: 700;
}

/* ==================== Word Cards ==================== */

body.neon-mode .word-card {
    background-color: var(--color-bg-card);
    border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.2),
                inset 0 0 20px rgba(0, 240, 255, 0.05);
}

body.neon-mode .word-card:hover {
    border-color: var(--neon-magenta);
    box-shadow: 0 0 20px rgba(255, 0, 110, 0.4),
                inset 0 0 30px rgba(255, 0, 110, 0.1);
}

body.neon-mode .word-english {
    color: var(--neon-cyan);
    text-shadow: 0 0 8px var(--neon-cyan);
}

body.neon-mode .word-japanese {
    color: var(--neon-magenta);
}

/* ==================== Mastery Status Neon Colors ==================== */

body.neon-mode .word-card[data-mastery="mastered"] {
    border-left: 4px solid var(--neon-green);
    box-shadow: -4px 0 15px rgba(57, 255, 20, 0.3),
                0 0 15px rgba(0, 240, 255, 0.2);
}

body.neon-mode .word-card[data-mastery="learning"] {
    border-left: 4px solid var(--neon-orange);
    box-shadow: -4px 0 15px rgba(255, 107, 0, 0.3),
                0 0 15px rgba(0, 240, 255, 0.2);
}

body.neon-mode .word-card[data-mastery="not-mastered"] {
    border-left: 4px solid var(--neon-magenta);
    box-shadow: -4px 0 15px rgba(255, 0, 110, 0.3),
                0 0 15px rgba(0, 240, 255, 0.2);
}

/* ==================== Statistics Cards ==================== */

body.neon-mode .statistics {
    background-color: var(--color-bg-card);
    border: 2px solid var(--neon-purple);
    box-shadow: 0 0 20px rgba(176, 38, 255, 0.3);
}

body.neon-mode .stat-label {
    color: var(--neon-purple);
}

body.neon-mode .stat-value {
    color: var(--neon-cyan);
    text-shadow: 0 0 10px var(--neon-cyan);
    font-weight: 700;
}

/* ==================== Floating Menu ==================== */

body.neon-mode .floating-menu {
    background-color: rgba(0, 0, 0, 0.95);
    border-top: 2px solid var(--neon-cyan);
    box-shadow: 0 -5px 30px rgba(0, 240, 255, 0.4);
    backdrop-filter: blur(10px);
}

body.neon-mode .floating-lang-btn {
    background-color: transparent;
    color: var(--neon-purple);
    border: 2px solid var(--neon-purple);
    box-shadow: 0 0 10px rgba(176, 38, 255, 0.3);
}

body.neon-mode .floating-lang-btn:hover {
    background-color: rgba(176, 38, 255, 0.1);
    border-color: var(--neon-purple);
    box-shadow: var(--glow-purple);
}

body.neon-mode .floating-lang-btn.active {
    background-color: var(--neon-purple);
    color: #000000;
    border-color: var(--neon-purple);
    box-shadow: var(--glow-purple);
    font-weight: 700;
}

body.neon-mode .floating-nav-btn {
    background-color: var(--neon-cyan);
    color: #000000;
    border: none;
    box-shadow: var(--glow-cyan);
    font-weight: 700;
}

body.neon-mode .floating-nav-btn:hover:not(:disabled) {
    background-color: var(--neon-blue);
    box-shadow: var(--glow-cyan-strong);
}

body.neon-mode .floating-nav-btn[id="scrollToTopBtn"] {
    background-color: var(--neon-green);
    box-shadow: var(--glow-green);
}

body.neon-mode .floating-nav-btn[id="scrollToTopBtn"]:hover:not(:disabled) {
    background-color: var(--neon-green);
    box-shadow: 0 0 10px var(--neon-green),
                0 0 20px var(--neon-green),
                0 0 40px var(--neon-green),
                0 0 60px var(--neon-green);
}

/* ==================== Sidebar Menu ==================== */

body.neon-mode .sidebar-menu {
    background-color: rgba(0, 0, 0, 0.98);
    border-left: 2px solid var(--neon-cyan);
    box-shadow: -5px 0 30px rgba(0, 240, 255, 0.4);
}

body.neon-mode .sidebar-header {
    background-color: var(--color-bg-header);
    border-bottom: 2px solid var(--neon-cyan);
}

body.neon-mode .sidebar-title {
    color: var(--neon-cyan);
    text-shadow: var(--text-glow-cyan);
}

body.neon-mode .sidebar-close-btn {
    color: var(--neon-magenta);
}

body.neon-mode .sidebar-close-btn:hover {
    color: var(--neon-magenta);
    text-shadow: var(--text-glow-magenta);
}

/* ==================== Hamburger Menu ==================== */

body.neon-mode .hamburger-line {
    background-color: var(--neon-cyan);
    box-shadow: 0 0 5px var(--neon-cyan);
}

/* ==================== Theme Toggle ==================== */

body.neon-mode .theme-toggle-label {
    color: var(--neon-purple);
}

/* ==================== Folder and Mastery Filters ==================== */

body.neon-mode .folder-selector,
body.neon-mode .mastery-filter {
    background-color: var(--color-bg-card);
    border: 2px solid var(--neon-purple);
    box-shadow: 0 0 20px rgba(176, 38, 255, 0.3);
}

body.neon-mode .folder-selector-btn,
body.neon-mode .mastery-filter-btn {
    background-color: transparent;
    color: var(--neon-purple);
    border: 2px solid var(--neon-purple);
    box-shadow: 0 0 10px rgba(176, 38, 255, 0.2);
}

body.neon-mode .folder-selector-btn:hover,
body.neon-mode .mastery-filter-btn:hover {
    border-color: var(--neon-purple);
    background-color: rgba(176, 38, 255, 0.1);
    box-shadow: var(--glow-purple);
}

body.neon-mode .folder-selector-btn.active,
body.neon-mode .mastery-filter-btn.active {
    background-color: var(--neon-purple);
    color: #000000;
    box-shadow: var(--glow-purple);
    font-weight: 700;
}

/* ==================== Folder Buttons (on cards) ==================== */

body.neon-mode .folder-btn {
    background-color: transparent;
    border: 2px solid var(--color-border);
}

body.neon-mode .folder-btn[data-folder="1"].active {
    background-color: var(--neon-blue);
    border-color: var(--neon-blue);
    color: #000000;
    box-shadow: 0 0 10px var(--neon-blue);
}

body.neon-mode .folder-btn[data-folder="2"].active {
    background-color: var(--neon-green);
    border-color: var(--neon-green);
    color: #000000;
    box-shadow: 0 0 10px var(--neon-green);
}

body.neon-mode .folder-btn[data-folder="3"].active {
    background-color: var(--neon-orange);
    border-color: var(--neon-orange);
    color: #000000;
    box-shadow: 0 0 10px var(--neon-orange);
}

body.neon-mode .folder-btn[data-folder="4"].active {
    background-color: var(--neon-purple);
    border-color: var(--neon-purple);
    color: #000000;
    box-shadow: 0 0 10px var(--neon-purple);
}

body.neon-mode .folder-btn[data-folder="5"].active {
    background-color: var(--neon-magenta);
    border-color: var(--neon-magenta);
    color: #000000;
    box-shadow: 0 0 10px var(--neon-magenta);
}

/* ==================== Mastery Buttons ==================== */

body.neon-mode .mastery-btn[data-status="mastered"].active {
    background-color: var(--neon-green);
    border-color: var(--neon-green);
    color: #000000;
    box-shadow: 0 0 10px var(--neon-green);
}

body.neon-mode .mastery-btn[data-status="learning"].active {
    background-color: var(--neon-orange);
    border-color: var(--neon-orange);
    color: #000000;
    box-shadow: 0 0 10px var(--neon-orange);
}

body.neon-mode .mastery-btn[data-status="not-mastered"].active {
    background-color: var(--neon-magenta);
    border-color: var(--neon-magenta);
    color: #000000;
    box-shadow: 0 0 10px var(--neon-magenta);
}

/* ==================== Section Selector ==================== */

body.neon-mode .section-selector {
    background-color: var(--color-bg-card);
    border: 2px solid var(--neon-cyan);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

body.neon-mode .section-checkbox-label {
    color: var(--color-text-primary);
}

body.neon-mode .section-checkbox-label:hover {
    background-color: rgba(0, 240, 255, 0.1);
}

/* ==================== TTS Icons ==================== */

body.neon-mode .tts-icon {
    color: var(--neon-cyan);
    text-shadow: 0 0 5px var(--neon-cyan);
}

body.neon-mode .tts-icon:hover {
    color: var(--neon-cyan);
    text-shadow: var(--text-glow-cyan);
}

/* ==================== Loading Spinner ==================== */

body.neon-mode .loading-spinner {
    border-color: rgba(0, 240, 255, 0.2);
    border-top-color: var(--neon-cyan);
    box-shadow: 0 0 20px var(--neon-cyan);
}

/* ==================== Related Words ==================== */

body.neon-mode .related-word {
    background-color: rgba(0, 240, 255, 0.05);
    border: 1px solid var(--neon-cyan);
    color: var(--neon-cyan);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

body.neon-mode .related-word:hover {
    background-color: rgba(0, 240, 255, 0.1);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
}

/* ==================== Badges ==================== */

body.neon-mode .word-level {
    background-color: rgba(176, 38, 255, 0.2);
    color: var(--neon-purple);
    border: 1px solid var(--neon-purple);
}

body.neon-mode .meaning-pos {
    background-color: rgba(0, 240, 255, 0.2);
    color: var(--neon-cyan);
    border: 1px solid var(--neon-cyan);
}

/* ==================== Footer ==================== */

body.neon-mode .footer {
    background-color: var(--color-bg-footer);
    border-top: 2px solid var(--neon-cyan);
    color: var(--neon-cyan);
    box-shadow: 0 -5px 20px rgba(0, 240, 255, 0.2);
}

/* ==================== Sidebar Overlay ==================== */

body.neon-mode .sidebar-overlay {
    background-color: rgba(0, 0, 0, 0.85);
}

/* ==================== Smooth Transitions ==================== */

body {
    transition: background-color 0.3s ease, color 0.3s ease;
}

.word-card,
.stat-card,
.floating-menu,
.sidebar-menu,
.level-btn,
.display-mode-btn,
.floating-lang-btn,
.folder-selector-btn,
.mastery-filter-btn {
    transition:
        background-color 0.3s ease,
        color 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.3s ease;
}

/* ==================== Card Header Labels ==================== */

body.neon-mode .card-label {
    color: var(--neon-cyan);
    text-shadow: 0 0 5px var(--neon-cyan);
}

/* ==================== Scrollbar Styling (Neon) ==================== */

body.neon-mode ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

body.neon-mode ::-webkit-scrollbar-track {
    background: #1a1a1a;
}

body.neon-mode ::-webkit-scrollbar-thumb {
    background: var(--neon-cyan);
    box-shadow: 0 0 10px var(--neon-cyan);
    border-radius: 5px;
}

body.neon-mode ::-webkit-scrollbar-thumb:hover {
    background: var(--neon-purple);
    box-shadow: 0 0 15px var(--neon-purple);
}