/* ========================================
   CSS Variables for Theming
   ======================================== */
:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #151b3b;
    --text-primary: #e0e6ff;
    --text-secondary: #8b93b8;
    --accent: #4a90e2;
    --segment-on: #00ff88;
    --segment-off: rgba(255, 255, 255, 0.05);
    --glow: rgba(0, 255, 136, 0.6);
    --shadow: rgba(0, 0, 0, 0.3);
    --border: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] {
    --bg-primary: #f0f4f8;
    --bg-secondary: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --accent: #3182ce;
    --segment-on: #00c853;
    --segment-off: rgba(0, 0, 0, 0.08);
    --glow: rgba(0, 200, 83, 0.4);
    --shadow: rgba(0, 0, 0, 0.1);
    --border: rgba(0, 0, 0, 0.1);
}

/* ========================================
   Global Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 20px;
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ========================================
   Header
   ======================================== */
header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent), var(--segment-on));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.5rem;
}

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

/* ========================================
   Display Wrapper
   ======================================== */
.display-wrapper {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px var(--shadow);
    margin-bottom: 40px;
    border: 1px solid var(--border);
}

.segment-display {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    min-height: 150px;
}

/* ========================================
   7-Segment Digit Structure
   ======================================== */
.digit {
    position: relative;
    width: 60px;
    height: 100px;
    display: inline-block;
}

/* Segment styling - each segment is a div */
.segment {
    position: absolute;
    background: var(--segment-off);
    transition: all 0.3s ease;
}

.segment.on {
    background: var(--segment-on);
    box-shadow: 0 0 10px var(--glow), 0 0 20px var(--glow);
}

/* Horizontal segments (top, middle, bottom) */
.segment-a, .segment-d, .segment-g {
    width: 40px;
    height: 8px;
    left: 10px;
    clip-path: polygon(10% 0%, 90% 0%, 100% 50%, 90% 100%, 10% 100%, 0% 50%);
}

.segment-a { top: 0; }
.segment-g { top: 46px; }
.segment-d { top: 92px; }

/* Vertical segments (left and right sides) */
.segment-b, .segment-c, .segment-e, .segment-f {
    width: 8px;
    height: 40px;
    clip-path: polygon(0% 10%, 50% 0%, 100% 10%, 100% 90%, 50% 100%, 0% 90%);
}

.segment-b { top: 5px; right: 2px; }
.segment-c { top: 51px; right: 2px; }
.segment-e { top: 51px; left: 2px; }
.segment-f { top: 5px; left: 2px; }

/* ========================================
   Controls
   ======================================== */
.controls {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 40px var(--shadow);
    margin-bottom: 30px;
    border: 1px solid var(--border);
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.control-group input[type="text"],
.control-group input[type="number"] {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.control-group input[type="text"]:focus,
.control-group input[type="number"]:focus {
    outline: none;
    border-color: var(--accent);
}

.control-group input[type="range"] {
    width: calc(100% - 80px);
    margin-right: 10px;
    vertical-align: middle;
}

#speedValue {
    display: inline-block;
    min-width: 60px;
    color: var(--text-secondary);
}

.control-group input[type="checkbox"] {
    margin-right: 8px;
    width: 18px;
    height: 18px;
    vertical-align: middle;
    cursor: pointer;
}

.button-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-top: 25px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 150px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), var(--segment-on));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px var(--glow);
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.btn-generate {
    width: 100%;
    margin-top: 10px;
    background: linear-gradient(135deg, #9b59b6, #e74c3c);
    color: white;
    font-size: 1.1rem;
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(231, 76, 60, 0.4);
}

/* ========================================
   Info Section
   ======================================== */
.info-section {
    background: var(--bg-secondary);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 40px var(--shadow);
    border: 1px solid var(--border);
}

.info-section h3 {
    margin-bottom: 15px;
    color: var(--accent);
}

.info-section ul {
    list-style: none;
    padding: 0;
}

.info-section li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

.info-section li:last-child {
    border-bottom: none;
}

.info-section strong {
    color: var(--text-primary);
}

/* ========================================
   Modal Styles
   ======================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 20px;
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    overflow: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 30px;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    margin: 0;
    color: var(--accent);
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s ease;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 30px;
}

.modal-subtitle {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

#generatedCode {
    background: var(--bg-primary);
    padding: 20px;
    border-radius: 10px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-primary);
    border: 1px solid var(--border);
    margin-bottom: 20px;
    white-space: pre-wrap;
    word-wrap: break-word;
}

#copyCode {
    width: 100%;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .display-wrapper {
        padding: 20px;
    }

    .digit {
        width: 45px;
        height: 75px;
    }

    .segment-a, .segment-d, .segment-g {
        width: 30px;
        height: 6px;
        left: 7.5px;
    }

    .segment-g { top: 34.5px; }
    .segment-d { top: 69px; }

    .segment-b, .segment-c, .segment-e, .segment-f {
        width: 6px;
        height: 30px;
    }

    .segment-b { top: 3.75px; }
    .segment-c { top: 38.25px; }
    .segment-e { top: 38.25px; }
    .segment-f { top: 3.75px; }

    .theme-toggle {
        position: static;
        margin: 20px auto 0;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        min-width: 100%;
    }
}

@media (max-width: 480px) {
    .segment-display {
        gap: 8px;
    }

    .digit {
        width: 35px;
        height: 60px;
    }

    .segment-a, .segment-d, .segment-g {
        width: 24px;
        height: 5px;
        left: 5.5px;
    }

    .segment-g { top: 27.5px; }
    .segment-d { top: 55px; }

    .segment-b, .segment-c, .segment-e, .segment-f {
        width: 5px;
        height: 24px;
    }

    .segment-b { top: 3px; }
    .segment-c { top: 30.5px; }
    .segment-e { top: 30.5px; }
    .segment-f { top: 3px; }
}

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

.digit {
    animation: fadeIn 0.5s ease;
}

/* Smooth segment transitions */
.segment {
    transition: background 0.2s ease, box-shadow 0.2s ease;
}