:root {
    /* Default Theme (Purple) */
    --bg-gradient-start: #667eea;
    --bg-gradient-end: #764ba2;
    --primary-color: #667eea;
    --primary-hover: #764ba2;
    --container-bg: #ffffff;
    --text-color: #333333;
    --text-secondary: #555555;
    --text-tertiary: #666666;
    --border-color: #e2e8f0;
    --surface-bg: #f7fafc;
}

body.theme-light {
    --bg-gradient-start: #97B22D;
    --bg-gradient-end: #89751B;
    --primary-color: #97B22D;
    --primary-hover: #89751B;
    --container-bg: #FEFCAD;
    --text-color: #2d3748;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --border-color: #d2cc54;
    --surface-bg: #f1ff72;
}

body.theme-dark {
    --bg-gradient-start: #2d3d0f;
    --bg-gradient-end: #1a2208;
    --primary-color: #97B22D;
    --primary-hover: #d2cc54;
    --container-bg: #1f2d0a;
    --text-color: #E3DAB2;
    --text-secondary: #d2cc54;
    --text-tertiary: #97B22D;
    --border-color: #3d4d1f;
    --surface-bg: #2a3a12;
}

body.theme-warm-light {
    --bg-gradient-start: #C6BE28;
    --bg-gradient-end: #97B22D;
    --primary-color: #E49A32;
    --primary-hover: #C6BE28;
    --container-bg: #FEFCAD;
    --text-color: #3d3d1f;
    --text-secondary: #5d5d3f;
    --text-tertiary: #7d7d5f;
    --border-color: #E3DAB2;
    --surface-bg: #faedb6;
}

body.theme-warm-dark {
    --bg-gradient-start: #2a2510;
    --bg-gradient-end: #1a1808;
    --primary-color: #E49A32;
    --primary-hover: #C6BE28;
    --container-bg: #2d2815;
    --text-color: #FEFCAD;
    --text-secondary: #E3DAB2;
    --text-tertiary: #C6BE28;
    --border-color: #4a3f1a;
    --surface-bg: #3a3220;
}

body.theme-red {
    --bg-gradient-start: #dc2626;
    --bg-gradient-end: #991b1b;
    --primary-color: #ef4444;
    --primary-hover: #dc2626;
    --container-bg: #ffffff;
    --text-color: #1f2937;
    --text-secondary: #374151;
    --text-tertiary: #4b5563;
    --border-color: #fecaca;
    --surface-bg: #fef2f2;
}

body.theme-pink {
    --bg-gradient-start: #ec4899;
    --bg-gradient-end: #be185d;
    --primary-color: #f472b6;
    --primary-hover: #ec4899;
    --container-bg: #ffffff;
    --text-color: #1f2937;
    --text-secondary: #374151;
    --text-tertiary: #4b5563;
    --border-color: #fbcfe8;
    --surface-bg: #fdf2f8;
}

body.theme-red-dark {
    --bg-gradient-start: #7f1d1d;
    --bg-gradient-end: #450a0a;
    --primary-color: #ef4444;
    --primary-hover: #f87171;
    --container-bg: #1a0505;
    --text-color: #fecaca;
    --text-secondary: #fca5a5;
    --text-tertiary: #f87171;
    --border-color: #7f1d1d;
    --surface-bg: #450a0a;
}

body.theme-pink-dark {
    --bg-gradient-start: #831843;
    --bg-gradient-end: #500724;
    --primary-color: #f472b6;
    --primary-hover: #f9a8d4;
    --container-bg: #1a050f;
    --text-color: #fce7f3;
    --text-secondary: #fbcfe8;
    --text-tertiary: #f9a8d4;
    --border-color: #831843;
    --surface-bg: #500724;
}

body.theme-black {
    --bg-gradient-start: #1f2937;
    --bg-gradient-end: #111827;
    --primary-color: #6b7280;
    --primary-hover: #9ca3af;
    --container-bg: #0f172a;
    --text-color: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --border-color: #374151;
    --surface-bg: #1e293b;
}

body.theme-blue {
    --bg-gradient-start: #3b82f6;
    --bg-gradient-end: #1e40af;
    --primary-color: #60a5fa;
    --primary-hover: #3b82f6;
    --container-bg: #ffffff;
    --text-color: #1f2937;
    --text-secondary: #374151;
    --text-tertiary: #4b5563;
    --border-color: #bfdbfe;
    --surface-bg: #eff6ff;
}

body.theme-blue-dark {
    --bg-gradient-start: #0c4a6e;
    --bg-gradient-end: #082f49;
    --primary-color: #38bdf8;
    --primary-hover: #0ea5e9;
    --container-bg: #0a1929;
    --text-color: #e0f2fe;
    --text-secondary: #7dd3fc;
    --text-tertiary: #38bdf8;
    --border-color: #0e7490;
    --surface-bg: #164e63;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    transition: background 0.3s ease;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 50px 20px 20px;
}

.container {
    background: var(--container-bg);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    width: 100%;
    min-height: 550px;
    transition: background 0.3s ease;
}

.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.home-btn {
    text-decoration: none;
    font-size: 1.5em;
    padding: 5px;
    transition: transform 0.2s ease, opacity 0.2s ease;
    opacity: 0.8;
    color: var(--primary-color);
}

.home-btn:hover {
    transform: scale(1.1);
    opacity: 1;
}

h1 {
    text-align: center;
    color: var(--text-color);
    font-size: 2em;
    flex: 1;
    margin: 0;
}

h2 {
    color: var(--text-color);
    font-size: 1.5em;
    margin-bottom: 15px;
}

h3 {
    color: var(--text-color);
    font-size: 1.2em;
    margin-bottom: 10px;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
    border-radius: 8px 8px 0 0;
    padding: 0;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.tab {
    flex: 1;
    padding: 12px 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    border-top: 3px solid transparent;
}

.tab:hover {
    color: var(--primary-color);
}

.tab.active {
    color: var(--primary-color);
    border-top-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.section {
    margin-bottom: 30px;
}

/* Converter Grid Layout */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.converter-column {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.converter-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 4px;
}

.btn-convert {
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.btn-convert:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

/* Player Section */
.player-section {
    background: var(--surface-bg);
    border-radius: 12px;
    padding: 15px;
    margin-top: 15px;
}

.player-controls {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.control-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
}

.control-label input[type="range"] {
    width: 120px;
}

.control-label select {
    padding: 6px 10px;
    font-size: 14px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: var(--container-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.control-label select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.player-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.btn-play {
    background: var(--primary-color);
    color: white;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.btn-play:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-stop {
    background: #ef4444;
    color: white;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.btn-stop:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.flash-indicator {
    width: 80px;
    height: 80px;
    margin: 15px auto;
    border-radius: 50%;
    background: var(--border-color);
    transition: none;
    display: none;
}

.flash-indicator.active {
    display: block;
}

.flash-indicator.flashing {
    background: #fbbf24;
    box-shadow: 0 0 30px #fbbf24;
}

.fullscreen-flash {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: black;
    z-index: 9999;
    display: none;
    pointer-events: auto;
    cursor: pointer;
}

.fullscreen-flash.active {
    display: block;
}

.fullscreen-flash.flashing {
    background: white;
}

.status {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
    min-height: 18px;
}

textarea {
    width: 100%;
    padding: 12px;
    font-size: 15px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    resize: vertical;
    font-family: 'Courier New', monospace;
    background: var(--surface-bg);
    color: var(--text-color);
    transition: border-color 0.3s ease;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

button {
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-start {
    background: var(--primary-color);
    color: white;
    margin: 10px 0;
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

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

.output {
    padding: 15px;
    background: var(--surface-bg);
    border-radius: 8px;
    margin-top: 10px;
    font-family: 'Courier New', monospace;
    font-size: 18px;
    min-height: 50px;
    color: var(--text-color);
    word-break: break-word;
}

.cheat-sheet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.cheat-item {
    background: var(--surface-bg);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cheat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.cheat-char {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.cheat-morse {
    font-family: 'Courier New', monospace;
    font-size: 20px;
    color: var(--text-color);
}

.controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex-wrap: wrap;
    margin: 15px 0;
}

.controls label {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-color);
    font-weight: 600;
}

.controls input[type="range"] {
    width: 150px;
}

.controls select {
    padding: 8px 12px;
    font-size: 14px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    background: var(--surface-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: border-color 0.3s ease;
}

.controls select:focus {
    outline: none;
    border-color: var(--primary-color);
}

#wpmValue {
    min-width: 30px;
    text-align: center;
}

.flash-indicator {
    width: 100px;
    height: 100px;
    margin: 20px auto;
    border-radius: 50%;
    background: var(--border-color);
    transition: background 0.1s ease;
}

.flash-indicator.flashing {
    background: #fbbf24;
    box-shadow: 0 0 30px #fbbf24;
}

.status {
    text-align: center;
    margin-top: 15px;
    font-size: 14px;
    color: var(--text-secondary);
    min-height: 20px;
}

.video-container {
    position: relative;
    width: 100%;
    max-width: 640px;
    margin: 20px auto;
    background: var(--surface-bg);
    border-radius: 8px;
    overflow: hidden;
}

#cameraVideo {
    width: 100%;
    height: auto;
    display: block;
}

.reader-output {
    margin-top: 20px;
}

.reader-mode {
    margin: 20px 0;
}

.tap-button-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 30px 0;
}

.tap-button {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    font-size: 24px;
    font-weight: bold;
    border: 5px solid var(--primary-hover);
    cursor: pointer;
    transition: all 0.1s ease;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.tap-button:hover {
    background: var(--primary-hover);
    transform: scale(1.02);
}

.tap-button:active,
.tap-button.active {
    background: #fbbf24;
    transform: scale(0.95);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3), 0 0 30px #fbbf24;
}

.controls label {
    cursor: pointer;
}

.controls input[type="radio"] {
    margin-right: 5px;
    cursor: pointer;
}

.theme-picker {
    position: relative;
}

.theme-btn-active {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    max-width: 32px;
    max-height: 32px;
    padding: 0;
    border-radius: 50%;
    border: 3px solid var(--text-color);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.theme-btn-active:hover {
    transform: scale(1.1);
}

.theme-dropdown {
    position: absolute;
    top: 40px;
    left: 0;
    background: var(--container-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 10px;
    display: none;
    grid-template-columns: 32px 32px;
    gap: 8px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.theme-dropdown[style*="display: grid"] {
    display: grid !important;
}

.theme-btn {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    max-width: 32px;
    max-height: 32px;
    padding: 0;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-btn:hover {
    transform: scale(1.1);
    border-color: var(--primary-color);
}

.theme-btn-active.theme-default,
.theme-btn.theme-default {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.theme-btn-active.theme-black,
.theme-btn.theme-black {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
}

.theme-btn-active.theme-blue,
.theme-btn.theme-blue {
    background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
}

.theme-btn-active.theme-blue-dark,
.theme-btn.theme-blue-dark {
    background: linear-gradient(135deg, #0c4a6e 0%, #38bdf8 100%);
}

.theme-btn-active.theme-light,
.theme-btn.theme-light {
    background: linear-gradient(135deg, #97B22D 0%, #E3DE81 100%);
}

.theme-btn-active.theme-dark,
.theme-btn.theme-dark {
    background: linear-gradient(135deg, #2d3d0f 0%, #97B22D 100%);
}

.theme-btn-active.theme-warm-light,
.theme-btn.theme-warm-light {
    background: linear-gradient(135deg, #E49A32 0%, #FEFCAD 100%);
}

.theme-btn-active.theme-warm-dark,
.theme-btn.theme-warm-dark {
    background: linear-gradient(135deg, #2a2510 0%, #E49A32 100%);
}

.theme-btn-active.theme-red,
.theme-btn.theme-red {
    background: linear-gradient(135deg, #dc2626 0%, #991b1b 100%);
}

.theme-btn-active.theme-red-dark,
.theme-btn.theme-red-dark {
    background: linear-gradient(135deg, #7f1d1d 0%, #ef4444 100%);
}

.theme-btn-active.theme-pink,
.theme-btn.theme-pink {
    background: linear-gradient(135deg, #ec4899 0%, #be185d 100%);
}

.theme-btn-active.theme-pink-dark,
.theme-btn.theme-pink-dark {
    background: linear-gradient(135deg, #831843 0%, #f472b6 100%);
}

/* Blinking cursor for morse display */
.morse-cursor {
    display: inline;
    color: var(--text-color);
    animation: blink-cursor 1s step-end infinite;
    font-weight: bold;
    margin-left: 2px;
}

@keyframes blink-cursor {
    0%, 50% {
        opacity: 1;
    }
    50.01%, 100% {
        opacity: 0;
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    body {
        padding: 0;
    }

    .container {
        max-width: 100%;
        width: 100%;
        min-height: 100vh;
        border-radius: 0;
        padding: 20px;
    }

    h1 {
        font-size: 1.5em;
    }

    .tab {
        padding: 10px 8px;
        font-size: 14px;
    }

    .converter-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .player-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .control-label {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .control-label input[type="range"] {
        width: 100%;
    }

    .player-buttons {
        flex-direction: column;
    }

    .btn-play, .btn-stop {
        width: 100%;
    }

    .cheat-sheet-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 8px;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .controls label {
        flex-direction: column;
        align-items: flex-start;
    }

    .controls input[type="range"] {
        width: 100%;
    }
}