/* ========================================
   AI Battle Interviewer - Dark Theme
   ======================================== */

:root {
    /* Core Colors */
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #1a1a1d;
    --bg-elevated: #222225;

    /* Accent Colors */
    --accent-red: #ff3b3b;
    --accent-red-dim: #991f1f;
    --accent-orange: #ff6b35;
    --accent-cyan: #00d4ff;
    --accent-green: #00ff88;

    /* Text Colors */
    --text-primary: #e8e8e8;
    --text-secondary: #888888;
    --text-muted: #555555;

    /* Border Colors */
    --border-color: #2a2a2d;
    --border-focus: var(--accent-red);

    /* Typography */
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;
    --font-sans: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-glow: 0 0 20px rgba(255, 59, 59, 0.15);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

/* Scanline Effect */
.scanline {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    background: repeating-linear-gradient(0deg,
            transparent,
            transparent 2px,
            rgba(0, 0, 0, 0.03) 2px,
            rgba(0, 0, 0, 0.03) 4px);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    backdrop-filter: blur(10px);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    font-size: 1.5rem;
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {

    0%,
    100% {
        filter: drop-shadow(0 0 4px var(--accent-red));
    }

    50% {
        filter: drop-shadow(0 0 12px var(--accent-red));
    }
}

.logo-text {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 2px;
    color: var(--text-secondary);
}

.logo-text .accent {
    color: var(--accent-red);
}

.status-bar {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: blink 1.5s ease-in-out infinite;
}

@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}

.status-text {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Main Container */
.main-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 80px var(--space-lg) var(--space-2xl);
    min-height: calc(100vh - 60px);
}

/* API Setup Section */
.api-setup {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 200px);
}

.setup-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    text-align: center;
    max-width: 480px;
    width: 100%;
    box-shadow: var(--shadow-card);
}

.setup-icon {
    font-size: 3rem;
    margin-bottom: var(--space-lg);
}

.setup-card h2 {
    font-size: 1.5rem;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.setup-card>p {
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.input-group {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
    /* 允許換行避免破版 */
}

.input-group input {
    flex: 1;
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    transition: border-color var(--transition-fast);
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-red);
    box-shadow: var(--shadow-glow);
}

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

.btn-primary {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: linear-gradient(135deg, var(--accent-red), var(--accent-orange));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(255, 59, 59, 0.4);
}

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

.btn-icon {
    transition: transform var(--transition-fast);
}

.btn-primary:hover .btn-icon {
    transform: translateX(4px);
}

.hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Interview Arena */
.interview-arena {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 160px);
}

.hidden {
    display: none !important;
}

.arena-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--space-lg);
}

.interviewer-profile {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.avatar {
    position: relative;
    width: 56px;
    height: 56px;
}

.avatar-inner {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--accent-red), var(--accent-orange));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.avatar-ring {
    position: absolute;
    inset: -4px;
    border: 2px solid var(--accent-red);
    border-radius: 50%;
    animation: rotate 8s linear infinite;
    border-top-color: transparent;
    border-left-color: transparent;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.profile-info h3 {
    font-size: 1.1rem;
    margin-bottom: 2px;
}

.profile-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.btn-secondary {
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    border-color: var(--accent-red);
    color: var(--accent-red);
}

/* Timer Bar */
.timer-bar-container {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
    border-radius: 2px;
    margin-bottom: 1rem;
}

.timer-bar {
    height: 100%;
    width: 0%;
    background: var(--accent-green);
    transition: width 1s linear, background 0.3s;
}

.timer-bar.warning {
    background: #ffa500;
}

.timer-bar.danger {
    background: var(--accent-red);
    box-shadow: 0 0 10px var(--accent-red);
}

/* Chat Container */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding-right: var(--space-sm);
    margin-bottom: var(--space-lg);
    position: relative;
}

.chat-container::-webkit-scrollbar {
    width: 6px;
}

.chat-container::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

.chat-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.chat-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.chat-messages {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

/* Message Styles */
.message {
    display: flex;
    gap: var(--space-md);
    animation: fadeInUp 0.3s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.message.interviewer .message-avatar {
    background: linear-gradient(135deg, var(--accent-red), var(--accent-orange));
}

.message.user .message-avatar {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.message-content {
    flex: 1;
    max-width: calc(100% - 56px);
}

.message-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
}

.message-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.message.interviewer .message-name {
    color: var(--accent-red);
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.message-text {
    background: var(--bg-secondary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    line-height: 1.7;
    font-size: 0.95rem;
}

.message.interviewer .message-text {
    border-left: 3px solid var(--accent-red);
}

.message.user .message-text {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-cyan);
}

/* Code blocks in messages */
.message-text code {
    font-family: var(--font-mono);
    background: var(--bg-primary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.85em;
    color: var(--accent-cyan);
}

.message-text pre {
    background: var(--bg-primary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: var(--space-md) 0;
}

.message-text pre code {
    background: none;
    padding: 0;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--space-md);
    align-items: center;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--accent-red);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.typing-indicator span:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-indicator span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {

    0%,
    80%,
    100% {
        transform: scale(0);
        opacity: 0.4;
    }

    40% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Input Area */
.input-area {
    border-top: 1px solid var(--border-color);
    padding-top: var(--space-lg);
}

.input-wrapper {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input-wrapper:focus-within {
    border-color: var(--accent-red);
    box-shadow: var(--shadow-glow);
}

.input-wrapper textarea {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    resize: none;
    min-height: 24px;
    max-height: 200px;
}

.input-wrapper textarea:focus {
    outline: none;
}

.input-wrapper textarea::placeholder {
    color: var(--text-muted);
}

.input-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-md);
    margin-top: var(--space-sm);
}

.char-count {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.btn-send {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-send:not(:disabled):hover {
    background: var(--accent-red);
    border-color: var(--accent-red);
    color: white;
    transform: scale(1.05);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: var(--space-sm);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--space-lg);
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.footer p {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent-red);
    text-transform: uppercase;
    letter-spacing: 1px;
    animation: flicker 3s infinite;
}

@keyframes flicker {

    0%,
    100% {
        opacity: 1;
    }

    92% {
        opacity: 1;
    }

    93% {
        opacity: 0.3;
    }

    94% {
        opacity: 1;
    }

    96% {
        opacity: 0.5;
    }

    97% {
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 640px) {
    .header-content {
        padding: 0 var(--space-md);
    }

    .main-container {
        padding: 70px var(--space-md) var(--space-lg);
    }

    .setup-card {
        padding: var(--space-xl);
    }

    .input-group {
        flex-direction: column;
    }

    .input-group input,
    .input-group .language-select,
    .input-group .btn-primary {
        width: 100%;
        /* 手機版全寬 */
    }

    .arena-header {
        flex-direction: column;
        gap: var(--space-md);
        align-items: flex-start;
    }

    .message {
        gap: var(--space-sm);
    }

    .message-avatar {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }
}

/* Special Effects */
.glitch {
    animation: glitch 0.5s ease;
}

@keyframes glitch {

    0%,
    100% {
        transform: translate(0);
    }

    20% {
        transform: translate(-2px, 2px);
    }

    40% {
        transform: translate(-2px, -2px);
    }

    60% {
        transform: translate(2px, 2px);
    }

    80% {
        transform: translate(2px, -2px);
    }
}

/* Devil Mode Indicator */
.devil-mode .interviewer-profile {
    animation: devil-pulse 0.5s ease;
}

@keyframes devil-pulse {

    0%,
    100% {
        filter: none;
    }

    50% {
        filter: drop-shadow(0 0 20px var(--accent-red));
    }
}

/* Screen Shake Effect for Cheating */
@keyframes shake {
    0% {
        transform: translate(1px, 1px) rotate(0deg);
    }

    10% {
        transform: translate(-1px, -2px) rotate(-1deg);
    }

    20% {
        transform: translate(-3px, 0px) rotate(1deg);
    }

    30% {
        transform: translate(3px, 2px) rotate(0deg);
    }

    40% {
        transform: translate(1px, -1px) rotate(1deg);
    }

    50% {
        transform: translate(-1px, 2px) rotate(-1deg);
    }

    60% {
        transform: translate(-3px, 1px) rotate(0deg);
    }

    70% {
        transform: translate(3px, 1px) rotate(-1deg);
    }

    80% {
        transform: translate(-1px, -1px) rotate(1deg);
    }

    90% {
        transform: translate(1px, 2px) rotate(0deg);
    }

    100% {
        transform: translate(1px, -2px) rotate(-1deg);
    }
}

.shaking {
    animation: shake 0.5s;
    animation-iteration-count: 1;
}

/* ========================================
   Language Select & Two-Phase Styles
   ======================================== */

/* Language Selection Dropdown */
.language-select {
    padding: var(--space-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    cursor: pointer;
    transition: border-color var(--transition-fast);
    min-width: 120px;
}

.language-select:focus {
    outline: none;
    border-color: var(--accent-red);
    box-shadow: var(--shadow-glow);
}

.language-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Setup Hint */
.setup-hint {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: var(--space-sm);
}

/* Tech Mode Avatar & Profile Colors */
.avatar.tech-mode .avatar-inner {
    background: linear-gradient(135deg, #00d4ff, #0080ff);
}

.avatar.tech-mode .avatar-ring {
    border-color: var(--accent-cyan);
    border-top-color: transparent;
    border-left-color: transparent;
}

.interviewer-profile.tech-mode h3 {
    color: var(--accent-cyan);
}

/* Transition Animation for Phase Change */
@keyframes phase-transition {
    0% {
        opacity: 0;
        transform: scale(0.9);
    }

    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.interviewer-profile {
    transition: all var(--transition-normal);
}

/* Mobile Responsive for Language Select */
@media (max-width: 640px) {
    .input-group {
        flex-direction: column;
    }

    .language-select {
        width: 100%;
    }
}