/**
 * D-Tools Cơ Khí - Styles
 */
:root {
    --primary: #0f172a;
    --accent: #06b6d4;
    --accent-hover: #22d3ee;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --card-bg: rgba(15, 23, 42, 0.8);
    --border: rgba(148, 163, 184, 0.2);
    --danger: #ef4444;
}
* { box-sizing: border-box; outline: none; -webkit-tap-highlight-color: transparent; }
html { -webkit-text-size-adjust: 100%; }

body {
    font-family: 'Be Vietnam Pro', sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    margin: 0;
    padding-bottom: 80px;
    color: var(--text);
    font-size: 14px;
    line-height: 1.6;
    min-height: 100vh;
}

header {
    background: var(--primary);
    color: var(--accent);
    padding: 15px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.15);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border-bottom: 1px solid var(--border);
}
header h1 { margin: 0; font-size: 1.2rem; text-transform: uppercase; letter-spacing: 0.1em; font-weight: 700; }

.nav-scroller {
    overflow-x: auto;
    white-space: nowrap;
    background: var(--card-bg);
    padding: 10px;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    gap: 6px;
}
.nav-btn {
    display: inline-block;
    padding: 8px 15px;
    margin-right: 0;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(6, 182, 212, 0.08);
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Be Vietnam Pro', sans-serif;
    flex: 0 0 auto;
}
.nav-btn:hover { border-color: rgba(6, 182, 212, 0.4); color: var(--text); }
.nav-btn.active {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    color: var(--primary);
    border-color: var(--accent);
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.container { padding: 1.25rem; max-width: 800px; margin: 0 auto; position: relative; z-index: 1; }
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.25rem;
    margin-bottom: 1.25rem;
    backdrop-filter: blur(12px);
    transition: transform 0.3s ease, border-color 0.3s, box-shadow 0.3s;
}
.card:hover {
    border-color: rgba(6, 182, 212, 0.4);
    box-shadow: 0 10px 30px rgba(6, 182, 212, 0.1);
}
.section-title {
    font-weight: 600;
    border-left: 4px solid var(--accent);
    padding-left: 10px;
    margin-bottom: 15px;
    color: var(--accent);
    text-transform: uppercase;
    font-size: 0.95rem;
    letter-spacing: 0.03em;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.full-width { grid-column: span 2; }
label { display: block; margin-bottom: 4px; font-weight: 500; font-size: 0.85rem; color: var(--text-muted); }
input, select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    background: rgba(15, 23, 42, 0.6);
    color: var(--text);
    font-family: 'Be Vietnam Pro', sans-serif;
}
input::placeholder { color: var(--text-muted); opacity: 0.8; }
input:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
}

.data-table { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 0.9rem; }
.data-table th {
    background: rgba(6, 182, 212, 0.15);
    padding: 8px 10px;
    text-align: left;
    border: 1px solid var(--border);
    font-weight: 600;
    color: var(--accent);
}
.data-table td { border: 1px solid var(--border); padding: 6px; color: var(--text-muted); }
.t2-dup-row td { background: rgba(245, 158, 11, 0.12); }
.t2-dup-badge {
    display: inline-block;
    margin-right: 6px;
    padding: 2px 6px;
    border-radius: 999px;
    border: 1px solid rgba(245, 158, 11, 0.55);
    color: #f59e0b;
    font-size: 0.72rem;
    font-weight: 600;
    vertical-align: middle;
}
.data-table input {
    border: none;
    padding: 5px;
    background: transparent;
    width: 100%;
    text-align: center;
    color: var(--text);
    font-family: 'Be Vietnam Pro', sans-serif;
}

.btn {
    border: none;
    padding: 12px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    font-size: 0.9rem;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    font-family: 'Be Vietnam Pro', sans-serif;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(6, 182, 212, 0.25); }
.btn-primary {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    color: white;
    box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}
.btn-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}
.btn-danger {
    background: var(--danger);
    color: white;
    width: auto;
    padding: 6px 12px;
    font-size: 0.8rem;
}
.btn-outline {
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.4);
    color: var(--accent);
}
.btn-outline:hover { background: rgba(6, 182, 212, 0.2); }

canvas {
    width: 100%;
    height: auto;
    border: 1px solid var(--border);
    background: rgba(15, 23, 42, 0.5);
    border-radius: 10px;
    margin-top: 10px;
}
.hidden { display: none !important; }
.app-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(2, 6, 23, 0.82);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    padding: 16px;
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.2s ease;
    white-space: normal;
}
.app-dialog-overlay.show { opacity: 1; }
.app-dialog {
    width: min(430px, 100%);
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.99), rgba(30, 41, 59, 0.99));
    border: 1px solid rgba(6, 182, 212, 0.35);
    border-radius: 16px;
    box-shadow: 0 24px 55px rgba(2, 6, 23, 0.6);
    overflow: hidden;
    transform: translateY(10px) scale(0.98);
    transition: transform 0.22s ease;
}
.app-dialog-overlay.show .app-dialog {
    transform: translateY(0) scale(1);
}
.app-dialog-head {
    padding: 13px 16px;
    border-bottom: 1px solid rgba(6, 182, 212, 0.2);
    color: var(--accent);
    font-weight: 700;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.app-dialog-icon {
    width: 18px;
    height: 18px;
    border-radius: 999px;
    border: 2px solid rgba(34, 211, 238, 0.95);
    color: rgba(34, 211, 238, 0.95);
    font-size: 12px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}
.app-dialog-body {
    padding: 14px 16px 12px;
    color: #b6c2d7;
    line-height: 1.6;
    font-size: 1rem;
}
.app-dialog-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-start;
    padding: 8px 16px 16px;
}
.app-dialog-btn {
    min-width: 108px;
    padding: 8px 12px;
    border-radius: 10px;
    border: 1px solid rgba(6, 182, 212, 0.55);
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    color: #fff;
    cursor: pointer;
    font-family: 'Be Vietnam Pro', sans-serif;
    font-weight: 600;
    transition: all 0.2s ease;
}
.app-dialog-btn:hover {
    border-color: rgba(6, 182, 212, 0.5);
    transform: translateY(-1px);
}
.app-dialog-btn.primary {
    background: rgba(8, 145, 178, 0.16);
    color: #22d3ee;
    border-color: rgba(34, 211, 238, 0.38);
}
.note-box {
    background: rgba(6, 182, 212, 0.1);
    color: var(--text-muted);
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 0.85rem;
    margin-bottom: 10px;
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.export-view {
    background: #fff;
    padding: 20px;
    border: 1px solid #e2e8f0;
    margin-top: 20px;
    border-radius: 10px;
    color: #0f172a;
}
.export-view table th,
.export-view table td { color: #0f172a; }
.export-header { text-align: center; font-weight: bold; margin-bottom: 10px; font-size: 1.2rem; color: #0f172a; }

.bar-visual {
    height: 30px;
    background: rgba(15, 23, 42, 0.6);
    display: flex;
    margin: 5px 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}
.bar-seg {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: white;
    border-right: 1px solid rgba(255,255,255,0.3);
    overflow: hidden;
}
.bg-cut { background: #10b981; }
.bg-waste { background: #64748b; }

#t1_opt h5, #t2_opt h5 { color: var(--accent); font-size: 0.95rem; margin-bottom: 6px; }

.door-section .door-diagram {
    max-width: 280px;
    margin: 0 auto 15px;
    padding: 10px;
    background: rgba(15, 23, 42, 0.5);
    border-radius: 10px;
    border: 1px solid var(--border);
}
.door-diagram svg,
.door-diagram img { width: 100%; max-width: 280px; height: auto; display: block; margin: 0 auto; }
.card-divider { border: none; border-top: 1px solid var(--border); margin: 1rem 0; }
.output-row {
    margin-top: 12px;
    padding: 10px 12px;
    background: rgba(6, 182, 212, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(6, 182, 212, 0.25);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}
.output-row label { margin: 0; color: var(--text-muted); }
.output-value { color: var(--accent); font-size: 1.1rem; }
.nhom-result { font-size: 0.9rem; line-height: 1.7; }
.nhom-result table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.nhom-result th, .nhom-result td { border: 1px solid var(--border); padding: 8px; text-align: left; }
.nhom-result th { background: rgba(6,182,212,0.15); color: var(--accent); }
.t5-diagram-box {
    position: relative;
    max-width: 100%;
    margin: 0 auto;
    padding: 12px;
    background: rgba(15, 23, 42, 0.6);
    border-radius: 12px;
    border: 1px solid var(--border);
    min-height: 120px;
}
.t5-diagram-img { width: 100%; max-width: 400px; height: auto; display: block; margin: 0 auto; border-radius: 8px; }
.t5-diagram-placeholder {
    padding: 24px 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.t5-diagram-placeholder code { font-size: 0.85rem; color: var(--accent); }
.t5-diagram-caption { margin: 8px 0 0; font-size: 0.85rem; color: var(--text-muted); text-align: center; }
.roof-diagram-box {
    max-width: 520px;
    margin: 12px auto 0;
    padding: 10px;
    background: rgba(15, 23, 42, 0.55);
    border-radius: 10px;
    border: 1px solid var(--border);
}
.roof-diagram-box img {
    width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 8px;
}
.roof-diagram-placeholder {
    display: none;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 10px 6px;
}
.site-footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 18px 12px 22px;
    letter-spacing: 0.02em;
}
@media (max-width: 480px) {
    .form-grid { grid-template-columns: 1fr; }
    .full-width { grid-column: span 1; }
    .nav-scroller { justify-content: flex-start; }
}