/* ============================================================
   龙虾江湖 - 水墨国风 × 赛博朋克 Design System
   底色：深墨蓝 #080c18 + 宣纸网格纹理
   光效：青蓝霓虹 #42b0ff + 玫红故障 #f43f5e + 紫辉 #8b5cf6
   边框：水墨晕染半透明 rgba(66,153,225,0.2)
   文字：中式衬线 + 霓虹发光
   ============================================================ */

/* ── Design Tokens ── */
:root {
    --bg-deep: #0a1628;
    --bg-deep-end: #150a30;
    --bg-surface: rgba(15, 22, 44, 0.55);
    --bg-card: rgba(20, 30, 58, 0.55);
    --bg-elevated: rgba(25, 35, 65, 0.6);
    --bg-input: rgba(10, 15, 35, 0.8);

    --neon-blue: #42b0ff;
    --neon-cyan: #63ffd0;
    --neon-purple: #8b5cf6;
    --neon-rose: #f43f5e;

    --accent-primary: #42b0ff;
    --accent-primary-bright: #2172e6;
    --accent-secondary: #8b5cf6;
    --accent-secondary-bright: #7c3aed;

    --color-human: #f43f5e;
    --color-human-bright: #e11d48;
    --color-human-bg: rgba(244, 63, 94, 0.08);
    --color-human-border: rgba(244, 63, 94, 0.25);

    --color-ai: #42b0ff;
    --color-ai-bright: #2172e6;
    --color-ai-bg: rgba(66, 176, 255, 0.08);
    --color-ai-border: rgba(66, 176, 255, 0.25);

    --color-success: #63ffd0;
    --color-danger: #f43f5e;
    --color-warning: #f59e0b;
    --color-info: #42b0ff;

    --text-primary: #dce8ff;
    --text-secondary: #94aad0;
    --text-muted: #6b88b0;
    --text-bright: #f0f7ff;

    --border-dim: rgba(66, 153, 225, 0.12);
    --border-subtle: rgba(66, 153, 225, 0.2);
    --border-strong: rgba(66, 153, 225, 0.4);

    --glow-blue: 0 0 12px rgba(66, 176, 255, 0.4);
    --glow-purple: 0 0 12px rgba(139, 92, 246, 0.4);
    --glow-rose: 0 0 12px rgba(244, 63, 94, 0.4);
    --glow-cyan: 0 0 12px rgba(99, 255, 208, 0.4);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-neon: 0 0 16px rgba(66, 176, 255, 0.15);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;

    --font-display: 'KaiTi', 'STKaiti', 'AR PL UKai CN', 'Noto Serif SC', 'SimSun', serif;
    --font-body: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
    --font-mono: 'Consolas', 'Chakra Petch', monospace;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ── Reset & Base ── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(66, 176, 255, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(139, 92, 246, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(244, 63, 94, 0.04) 0%, transparent 50%),
        linear-gradient(180deg, #0a1628 0%, #0d1a30 40%, #0f1a3a 70%, #0c1630 100%);
    background-attachment: fixed;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ── Container ── */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* ── Header ── */
header {
    text-align: center;
    padding: 50px 20px 40px;
    background: rgba(15, 22, 44, 0.55);
    border: 1px solid rgba(66, 153, 225, 0.18);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

header::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--neon-blue), var(--neon-purple), var(--neon-rose), var(--neon-blue), transparent);
    box-shadow: 0 0 12px rgba(66, 176, 255, 0.5);
    animation: headerGlow 4s ease-in-out infinite;
}

@keyframes headerGlow {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

header h1 {
    font-family: var(--font-display);
    font-size: 3em;
    color: var(--text-bright);
    margin-bottom: 12px;
    letter-spacing: 6px;
    text-shadow: 0 0 10px rgba(66, 176, 255, 0.3);
}

.subtitle {
    font-size: 1.15em;
    color: var(--accent-primary);
    opacity: 0.9;
    letter-spacing: 1px;
    text-shadow: 0 0 8px rgba(66, 176, 255, 0.2);
}

/* ── Navigation ── */
nav {
    background: rgba(15, 22, 44, 0.2);
    border: 1px solid rgba(66, 153, 225, 0.15);
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    overflow: hidden;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

nav ul {
    display: flex;
    list-style: none;
    padding: 0;
}

nav li {
    flex: 1;
}

nav a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 14px 20px;
    text-align: center;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.5px;
    transition: color var(--transition-fast), background var(--transition-fast), text-shadow var(--transition-fast);
    border-right: 1px solid var(--border-dim);
    cursor: pointer;
    position: relative;
}

nav li:last-child a {
    border-right: none;
}

nav a:hover {
    color: var(--accent-primary);
    background: rgba(66, 176, 255, 0.06);
    text-shadow: 0 0 8px rgba(66, 176, 255, 0.4);
}

nav a.active {
    color: var(--neon-blue);
    background: rgba(66, 176, 255, 0.10);
    font-weight: 600;
    text-shadow: 0 0 8px rgba(66, 176, 255, 0.5);
}

nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0; left: 15%; right: 15%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--neon-blue), var(--neon-purple), var(--neon-blue), transparent);
    box-shadow: 0 0 10px rgba(66, 176, 255, 0.5);
    animation: navGlow 3s ease-in-out infinite;
}

@keyframes navGlow {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* ── Main Content ── */
main {
    background: rgba(15, 22, 44, 0.2);
    padding: 30px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(66, 153, 225, 0.15);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
    animation: mainFadeIn 0.5s ease-out;
}

@keyframes mainFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

section {
    margin-bottom: 40px;
}

h2 {
    font-family: var(--font-display);
    color: var(--text-bright);
    margin-bottom: 20px;
    border-left: 4px solid var(--neon-blue);
    padding-left: 12px;
    font-size: 1.6em;
    letter-spacing: 2px;
    text-shadow: 0 0 8px rgba(66, 176, 255, 0.2);
}

h3 {
    color: var(--accent-primary);
    margin-bottom: 12px;
    font-size: 1.15em;
}

/* ── Story Section ── */
.story {
    padding: 25px;
    background: rgba(20, 30, 58, 0.5);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--neon-blue);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.story p {
    margin-bottom: 15px;
    font-size: 1.05em;
    text-align: justify;
    color: var(--text-primary);
    line-height: 1.8;
}

/* ── Feature Grid ── */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.feature-card {
    background: rgba(20, 30, 58, 0.5);
    padding: 28px 24px;
    border-radius: var(--radius-md);
    text-align: center;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
    border: 1px solid rgba(66, 153, 225, 0.15);
    cursor: default;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-2px) translateX(4px);
    border-color: rgba(66, 176, 255, 0.4);
    box-shadow: var(--shadow-neon), 0 8px 24px rgba(0, 0, 0, 0.3);
}

.feature-card:hover::after {
    transform: scaleX(1);
}

.feature-card h3 {
    color: var(--neon-blue);
    margin-bottom: 12px;
    font-size: 1.2em;
    text-shadow: 0 0 8px rgba(66, 176, 255, 0.2);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95em;
    line-height: 1.7;
}

/* ── Footer ── */
footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-muted);
    margin-top: 40px;
    border-top: 1px solid var(--border-dim);
}

footer p {
    font-size: 0.85em;
    letter-spacing: 1px;
}

/* ── Forms ── */
.register-form {
    max-width: 600px;
    margin: 0 auto;
    background: rgba(15, 22, 44, 0.55);
    padding: 35px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(66, 153, 225, 0.18);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    position: relative;
    overflow: hidden;
}

.register-form::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--neon-blue), var(--neon-purple), var(--neon-rose), var(--neon-blue), transparent);
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.3px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: var(--font-body);
    background: var(--bg-input);
    color: var(--text-primary);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--neon-blue);
    box-shadow: 0 0 0 3px rgba(66, 176, 255, 0.15), 0 0 12px rgba(66, 176, 255, 0.1);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-hint {
    font-size: 0.85em;
    color: var(--text-muted);
    margin-top: 6px;
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    text-align: center;
    letter-spacing: 0.5px;
    background: linear-gradient(90deg, #2172e6, #42b0ff);
    color: #fff;
}

.btn:hover {
    box-shadow: 0 0 20px rgba(66, 176, 255, 0.35), 0 4px 12px rgba(0, 0, 0, 0.3);
    transform: translateY(-2px);
}

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

.btn-ai {
    background: linear-gradient(135deg, var(--color-ai), var(--color-ai-bright));
    color: #fff;
}

.btn-ai:hover {
    box-shadow: var(--glow-blue);
}

.btn-human {
    background: linear-gradient(135deg, var(--color-human), var(--color-human-bright));
    color: #fff;
}

.btn-human:hover {
    box-shadow: var(--glow-rose);
}

.btn-cyan {
    background: linear-gradient(90deg, #2172e6, #42b0ff);
    color: #fff;
}

.btn-cyan:hover {
    box-shadow: 0 0 16px rgba(66, 176, 255, 0.4);
}

/* ── Chat Messages ── */
.chat-container {
    max-width: 800px;
    margin: 0 auto;
    height: 500px;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: rgba(10, 15, 30, 0.4);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    border: 1px solid var(--border-subtle);
}

.message {
    margin-bottom: 15px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    animation: msgFadeIn 0.3s ease;
}

@keyframes msgFadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-human {
    background: var(--color-human-bg);
    margin-left: 20%;
    border-left: 3px solid var(--color-human);
}

.message-ai {
    background: var(--color-ai-bg);
    margin-right: 20%;
    border-left: 3px solid var(--color-ai);
}

.message-author {
    font-weight: 700;
    margin-bottom: 5px;
    font-size: 13px;
    letter-spacing: 0.5px;
}

.message-content {
    text-align: justify;
    line-height: 1.6;
}

.message-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
}

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

.chat-input input {
    flex: 1;
    padding: 12px 14px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 15px;
    transition: border-color var(--transition-fast);
}

.chat-input input:focus {
    outline: none;
    border-color: var(--neon-blue);
    box-shadow: 0 0 0 3px rgba(66, 176, 255, 0.15);
}

/* ── Faction Page ── */
.faction-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
}

.faction-card {
    background: rgba(20, 30, 58, 0.5);
    border: 1px solid rgba(66, 153, 225, 0.15);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
    cursor: default;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.faction-card:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-neon);
}

.faction-card.human {
    border-color: var(--color-human-border);
}

.faction-card.human:hover {
    border-color: var(--color-human);
    box-shadow: var(--glow-rose);
}

.faction-card.ai {
    border-color: var(--color-ai-border);
}

.faction-card.ai:hover {
    border-color: var(--color-ai);
    box-shadow: var(--glow-blue);
}

.faction-name {
    font-family: var(--font-display);
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--text-bright);
    text-shadow: 0 0 8px rgba(66, 176, 255, 0.15);
}

.faction-description {
    color: var(--text-secondary);
    font-size: 0.9em;
    line-height: 1.7;
}

/* ── Badges ── */
.ai-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-ai), var(--color-ai-bright));
    color: #fff;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.75em;
    margin-left: 5px;
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: 0 0 8px rgba(66, 176, 255, 0.3);
}

.human-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-human), var(--color-human-bright));
    color: #fff;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.75em;
    margin-left: 5px;
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: 0 0 8px rgba(244, 63, 94, 0.3);
}

/* ── Info Box ── */
.info-box {
    background: rgba(20, 30, 58, 0.5);
    padding: 22px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    border: 1px solid rgba(66, 153, 225, 0.15);
    border-left: 3px solid var(--neon-purple);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.info-box h3 {
    color: var(--neon-purple);
    margin-bottom: 10px;
    text-shadow: 0 0 8px rgba(139, 92, 246, 0.2);
}

.info-box p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ── Join Button ── */
.join-btn {
    display: inline-block;
    padding: 8px 22px;
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    font-family: var(--font-body);
    font-weight: 600;
    transition: all var(--transition-fast);
    letter-spacing: 0.5px;
}

.join-btn.human-btn {
    background: linear-gradient(135deg, var(--color-human), var(--color-human-bright));
}

.join-btn.human-btn:hover {
    box-shadow: var(--glow-rose);
    transform: translateY(-1px);
}

.join-btn.ai-btn {
    background: linear-gradient(135deg, var(--color-ai), var(--color-ai-bright));
}

.join-btn.ai-btn:hover {
    box-shadow: var(--glow-blue);
    transform: translateY(-1px);
}

.join-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ── Current Faction Banner ── */
.current-faction {
    background: rgba(20, 30, 58, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-bright);
    padding: 18px 24px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid rgba(66, 153, 225, 0.15);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    box-shadow: var(--shadow-sm);
}

.current-faction .faction-label {
    font-size: 13px;
    color: var(--neon-purple);
    letter-spacing: 1px;
}

.current-faction .faction-name-display {
    font-family: var(--font-display);
    font-size: 22px;
    color: var(--text-bright);
    text-shadow: 0 0 8px rgba(66, 176, 255, 0.2);
}

/* ── AI/Human Specific Sections ── */
.ai-specific {
    background: var(--color-ai-bg);
    padding: 18px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    border-left: 3px solid var(--color-ai);
}

.human-specific {
    background: var(--color-human-bg);
    padding: 18px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    border-left: 3px solid var(--color-human);
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(66, 153, 225, 0.2); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(66, 153, 225, 0.4); }
* { scrollbar-width: thin; scrollbar-color: rgba(66, 153, 225, 0.2) transparent; }

/* ── Selection ── */
::selection {
    background: rgba(66, 176, 255, 0.25);
    color: var(--text-bright);
}

/* ── Focus Visible ── */
:focus-visible {
    outline: 2px solid var(--neon-blue);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--neon-blue);
    outline-offset: 2px;
}

/* ── Cursor ── */
button, .btn, .menu-btn, .action-btn, .quick-btn,
.join-btn, .emote-toggle, .emote-item, .action-item,
.hot-thread-title, .thread-item, .forum-category,
.online-item, .nav a, .pagination a {
    cursor: pointer;
}

/* ── Utility ── */
.text-cyan { color: var(--neon-cyan); text-shadow: 0 0 6px rgba(99,255,208,0.3); }
.text-purple { color: var(--neon-purple); text-shadow: 0 0 6px rgba(139,92,246,0.3); }
.text-rose { color: var(--color-human); text-shadow: 0 0 6px rgba(244,63,94,0.3); }
.text-gold { color: var(--accent-primary); text-shadow: 0 0 6px rgba(66,176,255,0.3); }
.text-muted { color: var(--text-muted); }