/* --- HỆ THỐNG BIẾN SẮC MÀU PREMIUM NOIR --- */
:root {
    --bg-main: #0b0b0e;
    --bg-darker: #050507;
    --panel-bg: rgba(18, 18, 23, 0.65);
    --panel-border: rgba(255, 255, 255, 0.06);
    --text-primary: #f3f4f6;
    --text-muted: #9ca3af;
    --accent-crimson: #c21d1d;
    --accent-crimson-glow: rgba(194, 29, 29, 0.35);
    --accent-gold: #d4af37;
    --accent-shadow: rgba(0, 0, 0, 0.8);
    --font-sans: 'Outfit', sans-serif;
    --font-mono: 'Courier Prime', monospace;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
}

/* HIỆU ỨNG ÁNH SÁNG PHÒNG CHIẾU PHIM (AMBIENT) */
.noir-ambient-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 70% 20%, rgba(194, 29, 29, 0.05) 0%, transparent 60%),
                radial-gradient(circle at 10% 80%, rgba(212, 175, 55, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: 1;
}

/* HIỆU ỨNG TỐI GÓC (VIGNETTE) */
.noir-vignette {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    box-shadow: inset 0 0 120px rgba(0, 0, 0, 0.95);
    pointer-events: none;
    z-index: 2;
}

/* CONTAINER CHÍNH */
.app-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 10;
}

/* HEADER CỔ ĐIỂN VỚI HIỆU ỨNG GLOW */
.app-header {
    text-align: center;
    margin-bottom: 45px;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
}

.logo-accent {
    font-size: 3.2rem;
    font-weight: 800;
    letter-spacing: 12px;
    color: var(--text-primary);
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.1),
                 3px 3px 0px var(--accent-crimson);
    position: relative;
    text-transform: uppercase;
}

.logo-sub {
    font-size: 0.9rem;
    letter-spacing: 6px;
    color: var(--accent-gold);
    text-transform: uppercase;
    font-weight: 600;
    margin-top: 5px;
}

.tagline {
    font-size: 1.05rem;
    color: var(--text-muted);
    font-weight: 300;
    max-width: 600px;
    margin: 0 auto;
}

/* GLASSMORPHISM PANEL CAO CẤP */
.glass-panel {
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 12px;
    padding: 35px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
    margin-bottom: 30px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.glass-panel:hover {
    border-color: rgba(194, 29, 29, 0.25);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.8),
                0 0 30px rgba(194, 29, 29, 0.05);
}

.panel-header {
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 20px;
    margin-bottom: 25px;
}

.panel-header h2 {
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* MẪU FORM ĐẸP MẮT */
.story-form {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

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

.flex-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

input[type="text"],
select,
textarea {
    width: 100%;
    background-color: rgba(8, 8, 12, 0.85);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

input[type="text"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-crimson);
    box-shadow: 0 0 10px var(--accent-crimson-glow);
    background-color: var(--bg-darker);
}

/* DYNAMIC CHARACTERS CONTAINER */
.characters-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 8px;
}

.character-row {
    display: grid;
    grid-template-columns: 180px 160px 1fr 45px;
    gap: 10px;
    align-items: center;
    background: rgba(0, 0, 0, 0.25);
    padding: 10px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    animation: fadeIn 0.3s ease;
}

.btn-remove-char {
    background: transparent;
    border: none;
    color: #e11d48;
    font-size: 1.8rem;
    cursor: pointer;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.btn-remove-char:hover {
    background: rgba(225, 29, 72, 0.1);
}

/* HỆ THỐNG NÚT BẤM (BUTTONS) */
.btn {
    font-family: var(--font-sans);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary {
    background-color: var(--accent-crimson);
    color: #fff;
    box-shadow: 0 8px 20px var(--accent-crimson-glow);
}

.btn-primary:hover {
    background-color: #dc2626;
    box-shadow: 0 12px 25px rgba(220, 38, 38, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-danger {
    background-color: #7f1d1d;
    border: 1px solid #991b1b;
    color: #fecaca;
    font-size: 0.95rem;
    padding: 14px 28px;
    box-shadow: 0 4px 15px rgba(127, 29, 29, 0.4);
}

.btn-danger:hover {
    background-color: #991b1b;
    color: #fff;
    box-shadow: 0 8px 25px rgba(153, 27, 27, 0.6);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 30px;
    font-size: 1.05rem;
    margin-top: 15px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.75rem;
}

/* TRUYỆN GIẤY KIỂU TYPEWRITER CỔ ĐIỂN */
.story-display-container {
    background: #f7f4eb; /* Màu giấy ố vàng ấm cúng */
    color: #1c1917; /* Màu mực xám đen */
    border: 8px double #d6d3d1;
    box-shadow: inset 0 0 30px rgba(0,0,0,0.1), 0 20px 40px rgba(0,0,0,0.5);
    padding: 50px;
    font-family: var(--font-mono);
    border-radius: 4px;
    margin-bottom: 35px;
    max-height: 700px;
    overflow-y: auto;
}

.story-paper h1 {
    font-size: 1.9rem;
    text-align: center;
    margin-bottom: 25px;
    text-transform: uppercase;
    font-weight: 700;
    border-bottom: 2px solid #a8a29e;
    padding-bottom: 12px;
    color: #0c0a09;
}

.story-paper h2 {
    font-size: 1.3rem;
    margin: 25px 0 15px 0;
    font-weight: 700;
    color: #44403c;
}

.story-paper p {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 18px;
    text-align: justify;
    text-indent: 30px;
}

/* KHU VỰC TƯƠNG TÁC CHỌN NGHI PHẠM */
.interactive-panel h3 {
    font-size: 1.3rem;
    letter-spacing: 1px;
    color: var(--accent-gold);
    margin-bottom: 5px;
}

.panel-subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 25px;
}

.suspects-voting-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 35px;
}

.suspect-card {
    background: rgba(10, 10, 14, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 8px;
    padding: 20px;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.suspect-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-gold);
    background: rgba(15, 15, 22, 0.85);
}

.card-blood-indicator {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: transparent;
    transition: background-color 0.3s ease;
}

.suspect-card.selected {
    border-color: var(--accent-crimson);
    box-shadow: 0 0 20px rgba(194, 29, 29, 0.3);
}

.suspect-card.selected .card-blood-indicator {
    background-color: var(--accent-crimson);
}

.suspect-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.suspect-card .traits {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 20px;
    flex-grow: 1;
}

/* PHÂN ĐOẠN KHÓA / HIỂN THỊ ĐÁP ÁN */
.solution-reveal-container {
    margin-top: 30px;
    border-top: 1px solid var(--panel-border);
    padding-top: 30px;
}

.reveal-lock-panel {
    text-align: center;
    background: rgba(127, 29, 29, 0.05);
    border: 1px dashed rgba(194, 29, 29, 0.3);
    padding: 30px;
    border-radius: 8px;
}

.reveal-lock-panel p {
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.reveal-lock-panel .small {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

.solution-content-panel {
    border-left: 4px solid var(--accent-crimson);
    padding: 30px;
    background: rgba(15, 10, 10, 0.9);
}

.solution-header h3 {
    color: var(--accent-crimson);
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(194, 29, 29, 0.2);
    padding-bottom: 10px;
}

.solution-body {
    font-size: 0.95rem;
    color: var(--text-primary);
    line-height: 1.7;
}

.solution-body h3 {
    font-size: 1.15rem;
    color: var(--accent-gold);
    margin: 20px 0 10px 0;
}

.solution-body li {
    margin-left: 20px;
    margin-bottom: 10px;
}

/* SPINNER & HIDE */
.hidden {
    display: none !important;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

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

/* FOOTER */
.app-footer {
    text-align: center;
    margin-top: 40px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* RESPONSIVE LAYOUT */
@media (max-width: 768px) {
    .character-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .btn-remove-char {
        grid-row: 1;
        justify-self: end;
        width: auto;
    }
    
    .story-display-container {
        padding: 25px;
    }
}