/* --- Biến màu cho Dark Theme --- */
:root {
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-panel: #2a2a2a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent: #ff6b6b;
    --accent-hover: #ff5252;
    --border-color: #444;
    --paper-color: #f4f1ea; /* Màu giấy báo */
    --ink-color: #1a1a1a;    /* Màu mực */
}

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

body {
    font-family: 'Lora', serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

.app-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 24px;
    padding: 24px;
    min-height: 100vh;
}

/* --- Khu vực nhập liệu --- */
.input-panel {
    background-color: var(--bg-panel);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    height: fit-content;
    position: sticky;
    top: 24px;
}

.input-panel h2 { font-family: 'Oswald', sans-serif; margin-bottom: 20px; color: var(--accent); }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; color: var(--text-secondary); font-size: 0.9em; }
.form-group input, .form-group textarea {
    width: 100%;
    padding: 10px 12px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: 'Lora', serif;
    font-size: 1em;
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.btn-primary, .btn-secondary {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-family: 'Oswald', sans-serif;
    font-size: 1em;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 10px;
}
.btn-primary { background-color: var(--accent); color: #fff; }
.btn-primary:hover { background-color: var(--accent-hover); }
.btn-secondary { background-color: #444; color: #fff; }
.btn-secondary:hover { background-color: #555; }
.btn-secondary:disabled { opacity: 0.5; cursor: not-allowed; }

/* --- Khu vực xem trước --- */
.preview-panel h2 { font-family: 'Oswald', sans-serif; margin-bottom: 20px; }

/* --- Style cho tờ báo --- */
.newspaper {
    background-color: var(--paper-color);
    color: var(--ink-color);
    padding: 40px;
    border-radius: 4px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    /* Hiệu ứng giấy cũ */
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
}

.newspaper-header {
    text-align: center;
    border-bottom: 4px double var(--ink-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}
.newspaper-name {
    font-family: 'Playfair Display', serif;
    font-size: 3em;
    font-weight: 900;
    letter-spacing: 2px;
    text-transform: uppercase;
}
.newspaper-date {
    font-family: 'Oswald', sans-serif;
    font-size: 0.9em;
    letter-spacing: 1px;
    border-top: 1px solid var(--ink-color);
    border-bottom: 1px solid var(--ink-color);
    padding: 4px 0;
    margin: 8px 0;
}
.newspaper-headline {
    font-family: 'Playfair Display', serif;
    font-size: 2.5em;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 16px;
    text-align: center;
}
.newspaper-body {
    column-count: 2;
    column-gap: 30px;
    font-size: 0.95em;
    text-align: justify;
    hyphens: auto;
}
.newspaper-body p::first-letter {
    font-size: 3em;
    font-weight: bold;
    float: left;
    line-height: 0.8;
    margin-right: 8px;
    font-family: 'Playfair Display', serif;
}

/* --- Style cho khu vực upload ảnh --- */
.form-group input[type="file"] {
    padding: 8px;
    font-size: 0.85em;
    cursor: pointer;
}
.form-group input[type="file"]::file-selector-button {
    background-color: var(--accent);
    color: #fff;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    font-family: 'Oswald', sans-serif;
    cursor: pointer;
    margin-right: 10px;
}
.form-group input[type="file"]::file-selector-button:hover {
    background-color: var(--accent-hover);
}

.image-preview-wrapper {
    display: none;
    position: relative;
    margin-top: 10px;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}
.image-preview-wrapper.active { display: block; }
.image-preview-wrapper img {
    display: block;
    width: 100%;
    height: auto;
    max-height: 200px;
    object-fit: cover;
}
#remove-image-btn {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(0,0,0,0.7);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 14px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}
#remove-image-btn:hover { background: var(--accent); }

.hint {
    display: block;
    margin-top: 6px;
    color: var(--text-secondary);
    font-size: 0.75em;
    font-style: italic;
}

/* --- Style ảnh trong tờ báo --- */
.newspaper-figure {
    margin: 16px 0;
    text-align: center;
    break-inside: avoid; /* Tránh bị cắt giữa các cột */
}
.newspaper-figure img {
    width: 100%;
    height: auto;
    border: 1px solid var(--ink-color);
    filter: grayscale(15%) contrast(1.05); /* Nhẹ nhàng giống ảnh báo in */
}
.newspaper-figure figcaption {
    font-family: 'Lora', serif;
    font-style: italic;
    font-size: 0.8em;
    color: #444;
    margin-top: 6px;
    border-bottom: 1px solid #999;
    padding-bottom: 4px;
    display: inline-block;
}

/* --- Dòng credit --- */
.credit-line {
    margin-top: 24px;
    padding-top: 12px;
    border-top: 1px dashed var(--ink-color);
    text-align: right;
    font-family: 'Oswald', sans-serif;
    font-size: 0.75em;
    color: #666;
    letter-spacing: 0.5px;
}

/* Responsive cho mobile */
@media (max-width: 768px) {
    .app-container { grid-template-columns: 1fr; }
    .newspaper-body { column-count: 1; }
    .newspaper-name { font-size: 2em; }
    .newspaper-headline { font-size: 1.8em; }
}

/* --- Cảnh báo dưới ô tên báo --- */
.hint-warn {
    color: #ffb347;
    font-style: normal;
    margin-top: 8px;
    padding: 6px 8px;
    background: rgba(255, 179, 71, 0.08);
    border-left: 3px solid #ffb347;
    border-radius: 3px;
}

/* Trạng thái lỗi khi tên vi phạm */
.form-group input.input-error {
    border-color: #ff5252;
    box-shadow: 0 0 0 2px rgba(255, 82, 82, 0.15);
}

/* Cảnh báo động hiện ra khi phát hiện tên không an toàn */
.dynamic-warning {
    margin-top: 8px;
    padding: 8px 10px;
    font-size: 0.8em;
    background: rgba(255, 82, 82, 0.1);
    border-left: 3px solid #ff5252;
    border-radius: 3px;
    color: #ff8a80;
    display: none;
}
.dynamic-warning.active { display: block; }