:root {
    --bg-color: #f3f4f6;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    
    /* Semantic Colors */
    --status-green: #10b981;
    --status-green-bg: #d1fae5;
    --status-orange: #f59e0b;
    --status-orange-bg: #fef3c7;
    --status-red: #ef4444;
    --status-red-bg: #fee2e2;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;

    /* Dark mode toggle transition */
    --transition-theme: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* ── Dark Mode Variables ────────────────────────────────────────── */
html.dark {
    --bg-color: #0f172a;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --card-bg: #1e293b;
    --border-color: #334155;
    --primary: #60a5fa;
    --primary-hover: #93c5fd;

    --status-green-bg: rgba(16, 185, 129, 0.15);
    --status-orange-bg: rgba(245, 158, 11, 0.15);
    --status-red-bg: rgba(239, 68, 68, 0.15);

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
}

/* System preference fallback (only when no manual class is set) */
@media (prefers-color-scheme: dark) {
    html:not(.light) {
        --bg-color: #0f172a;
        --text-main: #e2e8f0;
        --text-muted: #94a3b8;
        --card-bg: #1e293b;
        --border-color: #334155;
        --primary: #60a5fa;
        --primary-hover: #93c5fd;

        --status-green-bg: rgba(16, 185, 129, 0.15);
        --status-orange-bg: rgba(245, 158, 11, 0.15);
        --status-red-bg: rgba(239, 68, 68, 0.15);

        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    }
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
    padding-top: 70px;
    transition: var(--transition-theme);
}

.container {
    background-color: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    padding: 30px;
    transition: var(--transition-theme), transform 0.3s ease;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
}

header p {
    font-size: 14px;
    color: var(--text-muted);
}

/* ── Dark Mode Toggle Button ────────────────────────────────────── */
#dark-toggle {
    position: fixed;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--transition-theme), transform 0.3s ease, box-shadow 0.2s ease;
    box-shadow: var(--shadow-md);
    outline: none;
    z-index: 999;
}

#dark-toggle:hover {
    transform: rotate(20deg) scale(1.1);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

#dark-toggle:active {
    transform: rotate(20deg) scale(0.95);
}

/* Icon swap */
#dark-toggle .icon-sun  { display: none; }
#dark-toggle .icon-moon { display: block; }

html.dark #dark-toggle .icon-sun  { display: block; }
html.dark #dark-toggle .icon-moon { display: none; }

@media (prefers-color-scheme: dark) {
    html:not(.light) #dark-toggle .icon-sun  { display: block; }
    html:not(.light) #dark-toggle .icon-moon { display: none; }
}

.scanner-section {
    margin-bottom: 24px;
}

/* ── Camera Wrapper ───────────────────────────────────────────────── */
.camera-wrapper {
    position: relative;
    width: 100%;
    max-width: 300px;
    margin: 0 auto 14px;
    aspect-ratio: 4 / 3;
    background-color: rgba(128,128,128,0.07);
    border-radius: 16px;
    overflow: hidden;
    border: 2px solid var(--border-color);
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.camera-wrapper.active {
    border-color: var(--primary);
    background-color: #000;
}

/* ── Idle State ──────────────────────────────────────────────────── */
.camera-idle-state {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    cursor: pointer;
    z-index: 2;
    transition: opacity 0.3s ease;
}

.camera-idle-state.hidden {
    display: none !important;
}

.camera-icon-ring {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(59, 130, 246, 0.12);
    border: 2px solid rgba(59, 130, 246, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    animation: pulse-ring 2.5s ease-in-out infinite;
    transition: transform 0.2s ease;
}

.camera-idle-state:hover .camera-icon-ring {
    transform: scale(1.08);
    background: rgba(59, 130, 246, 0.2);
}

.camera-icon-ring svg {
    width: 36px;
    height: 36px;
}

@keyframes pulse-ring {
    0%, 100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.3); }
    50%       { box-shadow: 0 0 0 12px rgba(59, 130, 246, 0); }
}

.camera-idle-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* ── Reader container ────────────────────────────────────────────── */
#reader {
    position: absolute;
    inset: 0;
    width: 100% !important;
    height: 100% !important;
    border: none !important;
    background: transparent;
    overflow: hidden;
}

/* Ocultar controles generados por Html5QrcodeScanner (dashboard, header, select) */
#reader__dashboard              { display: none !important; }
#reader__header_message         { display: none !important; }
#reader__status_span            { display: none !important; }
#reader__filescan_input         { display: none !important; }

/* Hacer que el área de video llene el contenedor */
#reader__scan_region {
    position: absolute !important;
    inset: 0 !important;
    width: 100% !important;
    height: 100% !important;
    border: none !important;
}

/* El video debe cubrir todo el wrapper */
#reader video,
#reader__scan_region video {
    display: block !important;
    position: absolute !important;
    inset: 0 !important;
    width: 100% !important;
    height: 100% !important;
    object-fit: cover;
}

/* Ocultar la caja de escaneo que dibuja la librería (usamos nuestra propia) */
#reader__scan_region > img          { display: none !important; }
#reader__qr_shaded_region           { display: none !important; }
[id*="qr_shaded_region"]            { display: none !important; }


/* ── Scan Frame (corners + línea) ────────────────────────────────── */
.scan-frame {
    position: absolute;
    inset: 0;
    z-index: 3;
    pointer-events: none;
}

.scan-frame.hidden { display: none !important; }

.corner {
    position: absolute;
    width: 28px;
    height: 28px;
    border-color: var(--primary);
    border-style: solid;
}

.corner.tl { top: 18px; left: 18px; border-width: 3px 0 0 3px; border-radius: 4px 0 0 0; }
.corner.tr { top: 18px; right: 18px; border-width: 3px 3px 0 0; border-radius: 0 4px 0 0; }
.corner.bl { bottom: 18px; left: 18px; border-width: 0 0 3px 3px; border-radius: 0 0 0 4px; }
.corner.br { bottom: 18px; right: 18px; border-width: 0 3px 3px 0; border-radius: 0 0 4px 0; }

.scan-line {
    position: absolute;
    left: 18px;
    right: 18px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    animation: scan-move 2s ease-in-out infinite;
    border-radius: 2px;
    box-shadow: 0 0 8px var(--primary);
}

@keyframes scan-move {
    0%   { top: 22px; opacity: 0; }
    10%  { opacity: 1; }
    90%  { opacity: 1; }
    100% { top: calc(100% - 22px); opacity: 0; }
}

/* ── Camera Control Buttons ──────────────────────────────────────── */
.camera-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 16px;
}

.btn-camera {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 11px 22px;
    border-radius: 50px;
    border: none;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.2s ease, opacity 0.2s;
    outline: none;
}

.btn-camera svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.btn-start {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.btn-start:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(59, 130, 246, 0.5);
}

.btn-start:active {
    transform: translateY(0);
}

.btn-stop {
    background: rgba(239, 68, 68, 0.1);
    color: var(--status-red);
    border: 1.5px solid rgba(239, 68, 68, 0.35);
}

.btn-stop:hover {
    background: rgba(239, 68, 68, 0.18);
    transform: translateY(-2px);
}

.btn-stop:active {
    transform: translateY(0);
}

.btn-camera.hidden { display: none !important; }


.manual-entry {
    text-align: center;
}

.manual-entry p {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.input-group {
    display: flex;
    gap: 10px;
}

.input-group input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    outline: none;
    background-color: var(--card-bg);
    color: var(--text-main);
    transition: border-color 0.2s, background-color 0.3s ease, color 0.3s ease;
}

.input-group input::placeholder {
    color: var(--text-muted);
}

.input-group input:focus {
    border-color: var(--primary);
}

.input-group button {
    padding: 12px 20px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
    transition: background-color 0.2s;
}

.input-group button:hover {
    background-color: var(--primary-hover);
}

.hidden {
    display: none !important;
}

.result-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.status-indicator {
    flex-shrink: 0;
}

.status-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.student-info h2 {
    font-size: 18px;
    margin-bottom: 4px;
}

.student-info .dni {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.status-text {
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 10px;
    padding: 6px 12px;
    display: inline-block;
    border-radius: 20px;
}

.payment-details {
    font-size: 13px;
    color: var(--text-muted);
    background-color: rgba(128,128,128,0.08);
    padding: 8px 12px;
    border-radius: 8px;
    margin-top: 8px;
}

/* Academic details chips */
.academic-details {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 12px 0 10px;
}

.detail-chip {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 7px 12px;
    background-color: rgba(128,128,128,0.08);
    border-radius: 8px;
    font-size: 13px;
    gap: 8px;
}

.chip-label {
    color: var(--text-muted);
    white-space: nowrap;
    font-weight: 500;
}

.chip-value {
    font-weight: 600;
    color: var(--text-main);
    text-align: right;
    word-break: break-word;
}

/* Status: Green (Al día) */
.result-card.status-green {
    border-color: var(--status-green);
    background-color: var(--status-green-bg);
}
.result-card.status-green .status-icon {
    background-color: var(--status-green);
    color: white;
}
.result-card.status-green .status-icon::after {
    content: "✓";
}
.result-card.status-green .status-text {
    color: var(--status-green);
    background-color: rgba(16, 185, 129, 0.1);
}

/* Status: Orange (Próximo a vencer / Gracia) */
.result-card.status-orange {
    border-color: var(--status-orange);
    background-color: var(--status-orange-bg);
}
.result-card.status-orange .status-icon {
    background-color: var(--status-orange);
    color: white;
}
.result-card.status-orange .status-icon::after {
    content: "!";
}
.result-card.status-orange .status-text {
    color: var(--status-orange);
    background-color: rgba(245, 158, 11, 0.1);
}

/* Status: Red (Vencido) */
.result-card.status-red {
    border-color: var(--status-red);
    background-color: var(--status-red-bg);
}
.result-card.status-red .status-icon {
    background-color: var(--status-red);
    color: white;
}
.result-card.status-red .status-icon::after {
    content: "✕";
}
.result-card.status-red .status-text {
    color: var(--status-red);
    background-color: rgba(239, 68, 68, 0.1);
}

/* Loader */
.loading {
    opacity: 0.5;
    pointer-events: none;
}

/* ── Debt Accordion ──────────────────────────────────────────────── */
.debt-accordion {
    margin-top: 12px;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.1);
}

.debt-toggle {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: rgba(128,128,128,0.08);
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
    transition: background 0.2s, color 0.3s ease;
}

.debt-toggle:hover {
    background: rgba(128,128,128,0.15);
}

.toggle-arrow {
    font-size: 11px;
    transition: transform 0.25s ease;
}

.debt-accordion.open .toggle-arrow {
    transform: rotate(180deg);
}

.debt-list {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.debt-accordion.open .debt-list {
    max-height: 400px;
}

.debt-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 9px 14px;
    font-size: 13px;
    border-top: 1px solid var(--border-color);
    background: rgba(128,128,128,0.04);
    gap: 8px;
    transition: background-color 0.3s ease;
}

.debt-row:last-child {
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
}

.debt-concepto {
    font-weight: 600;
    color: var(--text-main);
}

.debt-fecha {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
}

.debt-badge {
    font-size: 10px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.debt-badge.vencido {
    background: rgba(239, 68, 68, 0.15);
    color: var(--status-red);
}

.debt-badge.pendiente {
    background: rgba(245, 158, 11, 0.15);
    color: var(--status-orange);
}

/* ── Responsive / Mobile ──────────────────────────────────────────── */
@media (max-width: 480px) {
    body {
        padding: 12px;
        padding-top: 68px;
        align-items: flex-start;
    }

    .container {
        padding: 20px 16px;
        border-radius: 10px;
    }

    /* Stack input and button on very small screens */
    .input-group {
        flex-direction: column;
        gap: 8px;
    }

    .input-group input {
        width: 100%;
        font-size: 15px;
    }

    .input-group button {
        width: 100%;
        padding: 13px 20px;
    }

    header h1 {
        font-size: 20px;
    }

    header p {
        font-size: 13px;
    }

    .result-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 12px;
    }

    .student-info .dni {
        margin-bottom: 8px;
    }

    .academic-details {
        width: 100%;
    }

    .debt-row {
        flex-wrap: wrap;
        gap: 6px;
    }

    #dark-toggle {
        top: 12px;
        right: 12px;
        width: 36px;
        height: 36px;
        font-size: 16px;
    }
}

@media (min-width: 481px) {
    body {
        align-items: center;
        padding-top: 20px;
    }
}