/* --- RESET & VARIABLES --- */
:root {
  --bg-main: #f9f9f9;
  --text-primary: #333;
  --text-secondary: #666;
  --accent-red: #da251d; /* Đỏ cờ */
  --accent-gold: #ffc72c; /* Vàng sao */
  --gradient-hero: linear-gradient(135deg, #c62828, #e53935, #ffc107, #ff9800);
  --gradient-panel: linear-gradient(180deg, #ffffff, #f5f5f5);
  --shadow-soft: 0 5px 20px rgba(0,0,0,0.08);
  --shadow-medium: 0 10px 30px rgba(0,0,0,0.15);
  --border-light: #eee;
}

* { box-sizing: border-box; }

body {
  font-family: 'Poppins', sans-serif;
  margin: 0;
  background: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* --- UTILITIES --- */
.highlight { color: var(--accent-red); font-weight: 700; }
.highlight-gold { color: var(--accent-gold); font-weight: 700; }
.text-center { text-align: center; }
.hidden { display: none !important; }
.content-hidden > :not(.welcome-screen-backdrop) { opacity: 0; visibility: hidden; transition: opacity 1s ease 0.5s; }
.content-visible > :not(.welcome-screen-backdrop) { opacity: 1; visibility: visible; }

/* --- WELCOME SCREEN --- */
.welcome-screen-backdrop {
  position: fixed; inset: 0;
  background: linear-gradient(135deg, #ffebee, #fffde7, #e1f5fe);
  z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  transition: opacity 1.5s ease, visibility 1.5s ease;
}
.welcome-screen-content {
  max-width: 600px; width: 100%;
  background: white; padding: 40px;
  border-radius: 20px;
  box-shadow: var(--shadow-medium);
  text-align: center;
  border-top: 5px solid var(--accent-gold);
  border-bottom: 5px solid var(--accent-red);
  position: relative; overflow: hidden;
}
/* Hiệu ứng nền cờ đỏ sao vàng mờ */
.welcome-screen-content::before {
    content: ''; position: absolute; inset: 0; opacity: 0.05;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Cpath fill='%23DA251D' d='M0 0h100v100H0z'/%3E%3Cpath fill='%23FFC72C' d='M50 20l10 30 30 10-25 15 10 25-25-20-25 20 10-25-25-15 30-10z'/%3E%3C/svg%3E");
    background-size: cover; z-index: -1;
}
.welcome-screen-content img {
  width: 100%; max-width: 400px; border-radius: 12px;
  margin-bottom: 25px; box-shadow: var(--shadow-soft);
}
.welcome-screen-content h1 {
  font-size: 28px; color: var(--accent-red); margin-bottom: 15px;
}
.welcome-screen-content p { font-size: 16px; color: var(--text-secondary); }
.welcome-screen-content .btn {
  background: linear-gradient(90deg, var(--accent-red), #e53935);
  color: white; border: none;
  box-shadow: 0 4px 15px rgba(218, 37, 29, 0.3);
}
.welcome-screen-content .btn:hover {
  transform: translateY(-2px); box-shadow: 0 6px 20px rgba(218, 37, 29, 0.4);
}

/* --- HEADER --- */
header {
  background: var(--gradient-hero);
  padding: 20px 40px;
  display: flex; justify-content: space-between; align-items: center;
  color: white;
  box-shadow: 0 2px 15px rgba(0,0,0,0.2);
  position: sticky; top: 0; z-index: 100;
}
.brand { display: flex; align-items: center; gap: 15px; }
.logo {
  width: 50px; height: 50px; background: white;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  padding: 8px; /* Thêm padding cho logo */
}
.logo svg { width: 100%; height: 100%; } /* Logo tự fill */
.brand h1 { margin: 0; font-size: 24px; font-weight: 700; text-shadow: 1px 1px 2px rgba(0,0,0,0.2); }
.brand p.lead { margin: 0; font-size: 14px; opacity: 0.9; }
.header-controls .btn {
  background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.4); color: white;
  backdrop-filter: blur(5px);
}
.header-controls .btn:hover { background: rgba(255,255,255,0.25); }

/* --- BUTTONS --- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 24px; border-radius: 30px;
  font-weight: 600; font-size: 15px; cursor: pointer;
  transition: all 0.3s ease;
}
.btn-primary {
  background: var(--accent-red); color: white; border: none;
  box-shadow: 0 4px 15px rgba(218, 37, 29, 0.2);
}
.btn-primary:hover { background: #c62828; transform: translateY(-2px); }
.btn-secondary {
  background: white; color: var(--accent-red); border: 2px solid var(--accent-red);
}
.btn-secondary:hover { background: #fce4ec; }
.btn-gold {
    background: linear-gradient(to right, #FFC72C, #FFD700); color: #333; border: none;
    box-shadow: 0 4px 15px rgba(255, 199, 44, 0.3);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255, 199, 44, 0.4); }


/* --- SECTIONS --- */
section {
  max-width: 1200px; margin: 40px auto; padding: 40px 30px;
  background: var(--gradient-panel);
  border-radius: 20px;
  box-shadow: var(--shadow-medium);
  border: 1px solid var(--border-light);
  position: relative;
  overflow: hidden; /* Cho các hiệu ứng nền */
}

/* Tiêu đề section với hiệu ứng gạch chân */
section h2 {
  text-align: center; font-size: 2.2rem; color: var(--accent-red);
  margin-bottom: 20px; position: relative; padding-bottom: 15px;
}
section h2::after {
  content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 80px; height: 4px; background: linear-gradient(to right, var(--accent-red), var(--accent-gold));
  border-radius: 2px;
}
section > p {
  text-align: center; max-width: 800px; margin: 0 auto 40px;
  font-size: 1.1rem; color: var(--text-secondary);
}

/* Hiệu ứng nền cho các section cụ thể */
.hero-legacy-panel::before {
    content: ''; position: absolute; top: -50px; left: -50px; width: 200px; height: 200px;
    background: radial-gradient(circle, rgba(218,37,29,0.05) 0%, transparent 70%);
    border-radius: 50%; z-index: 0; pointer-events: none;
}
.peacetime-heroes-panel::before {
    content: ''; position: absolute; bottom: -50px; right: -50px; width: 250px; height: 250px;
    background: radial-gradient(circle, rgba(255,199,44,0.08) 0%, transparent 70%);
    border-radius: 50%; z-index: 0; pointer-events: none;
}

/* --- HERO CARDS (Infographic Style) --- */
.hero-card-container {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px; position: relative; z-index: 1;
}
.hero-card {
  background: white; border-radius: 15px;
  padding: 25px; text-align: center;
  box-shadow: var(--shadow-soft);
  border-bottom: 4px solid transparent; /* Chuẩn bị cho hover */
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); /* Hiệu ứng nảy */
  display: flex; flex-direction: column;
}
.hero-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: var(--shadow-medium);
  border-bottom-color: var(--accent-gold); /* Hiện viền màu khi hover */
}
/* Ảnh đại diện tròn với viền hào quang */
.hero-card img {
  width: 140px; height: 140px; object-fit: cover; border-radius: 50%;
  margin: -10px auto 20px; /* Đẩy lên trên một chút */
  border: 4px solid white;
  box-shadow: 0 0 0 4px var(--accent-gold), var(--shadow-soft); /* Viền kép */
  transition: transform 0.4s ease;
}
.hero-card:hover img {
  transform: rotate(5deg) scale(1.05); /* Xoay nhẹ khi hover */
  box-shadow: 0 0 0 6px var(--accent-red), var(--shadow-medium); /* Đổi màu viền */
}
.hero-card h3 {
  font-size: 1.3rem; margin: 10px 0; color: var(--accent-red); font-weight: 700;
}
.hero-card p { font-size: 0.95rem; color: var(--text-secondary); flex-grow: 1; }
/* Style riêng cho câu trích dẫn */
.hero-card .quote {
  font-style: italic; color: #555; position: relative; padding: 15px;
  background: #fffde7; border-radius: 10px; margin: 15px 0;
  border-left: 4px solid var(--accent-gold);
}
.hero-card .quote::before {
  content: '“'; position: absolute; top: -5px; left: 10px;
  font-size: 40px; color: var(--accent-gold); opacity: 0.5; font-family: serif;
}

/* CTA Cuối section */
.final-cta {
  text-align: center; font-size: 1.2rem; margin-top: 40px;
  padding: 20px; background: rgba(218, 37, 29, 0.05); border-radius: 15px;
  color: var(--accent-red); font-weight: 600;
}

/* --- PLEDGE PANEL (Cam kết) --- */
.pledge-panel {
    background: linear-gradient(135deg, #fff8e1, #fffde7); /* Nền vàng nhạt */
    border: 2px solid var(--accent-gold);
    box-shadow: 0 15px 40px rgba(255, 199, 44, 0.2);
}
.pledge-panel h2 { color: var(--accent-red); }
.pledge-panel h2::after { background: var(--accent-red); }
.pledge-box {
  background: white; padding: 40px; border-radius: 20px;
  box-shadow: inset 0 0 20px rgba(255, 199, 44, 0.1);
  position: relative; max-width: 800px; margin: 0 auto;
  border: 3px dashed var(--accent-gold); /* Viền nét đứt */
}
/* Huy hiệu cam kết */
.pledge-box::before {
    content: 'CAM KẾT'; position: absolute; top: -20px; left: 50%; transform: translateX(-50%);
    background: var(--accent-red); color: white; padding: 8px 25px;
    border-radius: 20px; font-weight: 700; font-size: 14px;
    box-shadow: 0 4px 10px rgba(218, 37, 29, 0.3);
}
.pledge-quote {
  font-size: 1.4rem; font-weight: 600; color: #d84315; /* Màu cam đậm */
  font-style: italic; line-height: 1.4;
}

/* --- MAIN CREATION TOOL --- */
main {
  display: grid; grid-template-columns: 1fr 450px; gap: 40px;
  max-width: 1200px; margin: 40px auto; padding: 0 30px;
}
.panel.creation-tool {
    background: white; padding: 30px; border-radius: 20px;
    box-shadow: var(--shadow-medium);
}
.form-group { margin-bottom: 25px; }
label { display: block; margin-bottom: 10px; font-weight: 600; color: var(--text-primary); }
input, select, textarea {
  width: 100%; padding: 14px; border: 2px solid var(--border-light);
  border-radius: 12px; font-family: inherit; font-size: 15px;
  transition: all 0.3s ease; background: #fdfdfd;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--accent-gold); box-shadow: 0 0 0 4px rgba(255, 199, 44, 0.15); outline: none;
}
textarea { resize: vertical; height: 120px; }
.char-count { text-align: right; font-size: 0.85rem; color: #999; margin-top: 5px; }

/* Templates Selection */
.templates-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); gap: 15px;
}
.template-option {
  background: #f5f5f5; border: 3px solid transparent; border-radius: 15px;
  padding: 15px; text-align: center; cursor: pointer;
  transition: all 0.3s ease;
}
.template-option:hover { background: #f0f0f0; transform: translateY(-3px); }
.template-option.selected {
  border-color: var(--accent-red); background: #ffebee;
  box-shadow: 0 5px 15px rgba(218, 37, 29, 0.2);
}
.template-icon { font-size: 32px; display: block; margin-bottom: 8px; }

/* --- CARD PREVIEW --- */
.card-preview-container { position: sticky; top: 100px; }
.card-preview-label {
    text-align: center; font-weight: 700; color: var(--accent-red); margin-bottom: 20px; font-size: 1.2rem;
}
.card {
  width: 100%; aspect-ratio: 3/4; /* Tỷ lệ dọc */
  background: white; border-radius: 25px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  position: relative; overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform 0.3s ease;
}
.card:hover { transform: scale(1.02); }
.card-decor { position: absolute; inset: 0; z-index: 0; }
.card-content {
  position: relative; z-index: 1; flex-grow: 1;
  padding: 40px 30px; display: flex; flex-direction: column; justify-content: center; text-align: center;
}
.card h2 { font-size: 1.6rem; margin-bottom: 20px; color: var(--text-primary); }
.card p.message {
    font-size: 1.2rem; line-height: 1.6; color: #444;
    font-style: italic; margin-bottom: 30px;
}
.card p.sign { font-weight: 600; color: var(--accent-red); font-size: 1.1rem; }
.card-footer {
  text-align: center; padding: 15px; font-size: 0.9rem; font-weight: 600;
  color: white; background: var(--accent-red); z-index: 1;
}

/* --- GALLERY --- */
.gallery-section { background: #fff; border-top: 5px solid var(--accent-gold); }
.gallery-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 25px;
}
.gallery-item {
    background: white; border-radius: 15px; padding: 25px;
    box-shadow: var(--shadow-soft); border: 2px solid var(--border-light);
    display: flex; flex-direction: column;
    transition: all 0.3s ease;
    position: relative;
}
/* Hiệu ứng ghim giấy */
.gallery-item::before {
    content: ''; position: absolute; top: -10px; left: 50%; transform: translateX(-50%);
    width: 20px; height: 20px; background: #aaa; border-radius: 50%;
    box-shadow: inset 0 -2px 5px rgba(0,0,0,0.2);
}
.gallery-item:hover { transform: translateY(-5px) rotate(1deg); box-shadow: var(--shadow-medium); border-color: var(--accent-gold); }
.gallery-item .to { font-weight: 700; color: var(--accent-red); margin-bottom: 15px; }
.gallery-item .msg { flex-grow: 1; font-style: italic; color: #555; margin-bottom: 20px; position: relative; padding-left: 15px; }
.gallery-item .msg::before { content: '“'; position: absolute; left: 0; top: -5px; font-size: 30px; color: var(--accent-gold); opacity: 0.5; }
.gallery-item .sign { text-align: right; font-weight: 600; color: var(--text-secondary); }

/* --- FOOTER --- */
footer {
  background: #333; color: #ccc; text-align: center; padding: 40px 20px;
  font-size: 0.95rem;
}
footer p { max-width: 600px; margin: 0 auto 10px; }
footer .highlight-gold { color: var(--accent-gold); }

/* --- MEDIA QUERIES --- */
@media (max-width: 900px) {
  main { grid-template-columns: 1fr; }
  .card-preview-container { position: static; margin-bottom: 40px; }
  .card { max-width: 400px; margin: 0 auto; }
}
@media (max-width: 600px) {
  header { flex-direction: column; gap: 15px; padding: 20px; text-align: center; }
  .brand { flex-direction: column; }
  .hero-card-container { grid-template-columns: 1fr; }
  section h2 { font-size: 1.8rem; }
}

/* --- ANIMATIONS & DECOR STYLES --- */
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-15px); } }
@keyframes pulse-gold { 0% { box-shadow: 0 0 0 0 rgba(255, 199, 44, 0.7); } 70% { box-shadow: 0 0 0 15px rgba(255, 199, 44, 0); } 100% { box-shadow: 0 0 0 0 rgba(255, 199, 44, 0); } }

/* Theme-specific Card Styles */
.card[data-theme="peace"] {
    background: linear-gradient(180deg, #e3f2fd, #bbdefb); color: #0d47a1;
}
.card[data-theme="peace"] .card-footer { background: #1976d2; }
.card[data-theme="peace"] .card-decor svg { fill: #90caf9; opacity: 0.4; animation: float 6s ease-in-out infinite; }

.card[data-theme="love"] {
    background: linear-gradient(180deg, #ffebee, #ffcdd2); color: #b71c1c;
}
.card[data-theme="love"] .card-footer { background: #d32f2f; }
.card[data-theme="love"] .card-decor svg { fill: #ef9a9a; opacity: 0.4; animation: float 7s ease-in-out infinite reverse; }

.card[data-theme="future"] {
    background: linear-gradient(180deg, #e8f5e9, #c8e6c9); color: #1b5e20;
}
.card[data-theme="future"] .card-footer { background: #388e3c; }
.card[data-theme="future"] .card-decor svg { fill: #a5d6a7; opacity: 0.4; animation: float 8s ease-in-out infinite;