/* ============================================================
   AI Chat - Stylesheet
   Tema: Dark (default), Light, Classic
   Desain: Minimalis, elegan, seperti ChatGPT / Gemini / Claude
   ============================================================ */

/* ========== CSS VARIABLES ========== */
:root {
    /* Default: Dark Theme */
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-tertiary: #0f3460;
    --bg-chat: #1a1a2e;
    --bg-input: #16213e;
    --text-primary: #eaeaea;
    --text-secondary: #a0a0b0;
    --text-muted: #6c6c80;
    --bubble-user: #0f3460;
    --bubble-ai: #1e2a4a;
    --border-color: #2a2a4a;
    --accent: #4a9eff;
    --accent-hover: #3a8eef;
    --danger: #e05555;
    --danger-hover: #c04444;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --transition-speed: 0.3s;
    --radius: 12px;
    --radius-sm: 8px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* ========== LIGHT THEME ========== */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #e8e8ed;
    --bg-chat: #ffffff;
    --bg-input: #f5f5f7;
    --text-primary: #1a1a2e;
    --text-secondary: #555566;
    --text-muted: #9999aa;
    --bubble-user: #e8f0fe;
    --bubble-ai: #f5f5f7;
    --border-color: #e0e0e8;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* ========== CLASSIC THEME ========== */
[data-theme="classic"] {
    --bg-primary: #fdf6e3;
    --bg-secondary: #eee8d5;
    --bg-tertiary: #d5cdb8;
    --bg-chat: #fdf6e3;
    --bg-input: #eee8d5;
    --text-primary: #3b3b2f;
    --text-secondary: #6b6b55;
    --text-muted: #9b9b80;
    --bubble-user: #e8e0c8;
    --bubble-ai: #f5edd6;
    --border-color: #d5cdb8;
    --accent: #8b6f47;
    --accent-hover: #6b5537;
    --danger: #c94f4f;
    --danger-hover: #a83d3d;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* ========== RESET & BASE ========== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height untuk mobile */
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    -webkit-tap-highlight-color: transparent;
    -webkit-font-smoothing: antialiased;
}

/* ========== HEADER ========== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
    z-index: 10;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.3px;
    user-select: none;
}

/* ========== BUTTONS ========== */
.btn-icon {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1.2rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.btn-icon:hover {
    background-color: var(--bg-tertiary);
}

.btn-icon:active {
    transform: scale(0.95);
}

.btn-send {
    width: 40px;
    height: 40px;
    border: none;
    background-color: var(--accent);
    color: #ffffff;
    font-size: 1.2rem;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, transform 0.1s;
    flex-shrink: 0;
}

.btn-send:hover {
    background-color: var(--accent-hover);
}

.btn-send:active {
    transform: scale(0.93);
}

.btn-send:disabled {
    background-color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.5;
}

.send-icon {
    display: inline-block;
    font-size: 1.1rem;
}

.btn-secondary {
    display: block;
    width: 100%;
    padding: 10px 14px;
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    text-align: left;
    transition: background-color 0.2s, border-color 0.2s;
}

.btn-secondary:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent);
}

.btn-danger {
    display: block;
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--danger);
    background-color: transparent;
    color: var(--danger);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    text-align: left;
    transition: background-color 0.2s, color 0.2s;
}

.btn-danger:hover {
    background-color: var(--danger);
    color: #ffffff;
}

/* ========== CHAT AREA ========== */
.chat-area {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    scroll-behavior: smooth;
    background-color: var(--bg-chat);
    transition: background-color var(--transition-speed);
    -webkit-overflow-scrolling: touch;
}

.chat-area::-webkit-scrollbar {
    width: 5px;
}

.chat-area::-webkit-scrollbar-track {
    background: transparent;
}

.chat-area::-webkit-scrollbar-thumb {
    background-color: var(--text-muted);
    border-radius: 10px;
}

/* ========== WELCOME MESSAGE ========== */
.welcome-message {
    text-align: center;
    padding: 40px 20px;
    margin: auto;
    max-width: 400px;
}

.welcome-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.welcome-message h2 {
    font-size: 1.3rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.welcome-message p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ========== CHAT BUBBLES ========== */
.chat-bubble {
    display: flex;
    flex-direction: column;
    max-width: 85%;
    animation: bubbleIn 0.3s ease-out;
}

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

.chat-bubble.user {
    align-self: flex-end;
}

.chat-bubble.ai {
    align-self: flex-start;
}

.bubble-content {
    padding: 12px 16px;
    border-radius: var(--radius);
    line-height: 1.6;
    word-wrap: break-word;
    overflow-wrap: break-word;
    font-size: 0.95rem;
    position: relative;
}

.chat-bubble.user .bubble-content {
    background-color: var(--bubble-user);
    color: var(--text-primary);
    border-bottom-right-radius: 4px;
}

.chat-bubble.ai .bubble-content {
    background-color: var(--bubble-ai);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
    border: 1px solid var(--border-color);
}

/* Markdown sederhana dalam bubble AI */
.bubble-content p {
    margin-bottom: 8px;
}

.bubble-content p:last-child {
    margin-bottom: 0;
}

.bubble-content code {
    background-color: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    font-family: 'SF Mono', 'Fira Code', monospace;
}

.bubble-content pre {
    background-color: var(--bg-tertiary);
    padding: 12px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 8px 0;
}

.bubble-content pre code {
    background: none;
    padding: 0;
}

/* ========== BUBBLE ACTIONS ========== */
.bubble-actions {
    display: flex;
    gap: 4px;
    margin-top: 4px;
    padding: 0 4px;
    opacity: 0;
    transition: opacity 0.2s;
}

.chat-bubble:hover .bubble-actions {
    opacity: 1;
}

.bubble-action-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.75rem;
    padding: 2px 6px;
    border-radius: 4px;
    transition: color 0.2s, background-color 0.2s;
}

.bubble-action-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

/* ========== TIMESTAMP ========== */
.bubble-timestamp {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 2px;
    padding: 0 8px;
}

/* ========== TYPING INDICATOR ========== */
.typing-indicator {
    align-self: flex-start;
    padding: 12px 16px;
    background-color: var(--bubble-ai);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    border-bottom-left-radius: 4px;
    display: flex;
    gap: 4px;
    align-items: center;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background-color: var(--text-muted);
    border-radius: 50%;
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

/* ========== ERROR BUBBLE ========== */
.chat-bubble.error .bubble-content {
    background-color: #fff0f0;
    border: 1px solid #e05555;
    color: #c04444;
}

[data-theme="dark"] .chat-bubble.error .bubble-content {
    background-color: #2a1515;
    border-color: #663333;
    color: #e05555;
}

/* ========== INPUT AREA ========== */
.input-area {
    flex-shrink: 0;
    padding: 12px 16px;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.input-container {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    background-color: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 8px 12px;
    transition: border-color 0.2s, background-color var(--transition-speed);
}

.input-container:focus-within {
    border-color: var(--accent);
}

.message-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-family);
    resize: none;
    outline: none;
    line-height: 1.5;
    max-height: 150px;
    overflow-y: auto;
}

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

.input-hint {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: 6px;
}

/* ========== OVERLAY ========== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 20;
    opacity: 1;
    transition: opacity var(--transition-speed);
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

/* ========== SETTINGS PANEL ========== */
.settings-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    max-width: 85vw;
    height: 100%;
    height: 100dvh;
    background-color: var(--bg-secondary);
    z-index: 30;
    transform: translateX(0);
    transition: transform var(--transition-speed) ease;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
    overflow-y: auto;
}

.settings-panel.hidden {
    transform: translateX(-100%);
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.settings-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
}

.settings-body {
    padding: 16px;
    flex: 1;
    overflow-y: auto;
}

.settings-section {
    margin-bottom: 24px;
}

.settings-section label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 8px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.settings-section select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: var(--font-family);
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236c6c80' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.theme-options {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.theme-btn {
    flex: 1;
    min-width: 80px;
    padding: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-input);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}

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

.theme-btn.active {
    border-color: var(--accent);
    background-color: var(--accent);
    color: #ffffff;
}

.about-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========== TOAST ========== */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 12px 20px;
    border-radius: var(--radius);
    font-size: 0.85rem;
    z-index: 50;
    box-shadow: var(--shadow);
    transition: opacity 0.3s, transform 0.3s;
    pointer-events: none;
    text-align: center;
    max-width: 90vw;
}

.toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
}

.toast.success {
    border-left: 3px solid #4caf50;
}

.toast.error {
    border-left: 3px solid #e05555;
}

/* ========== HIDDEN ========== */
.hidden {
    display: none !important;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 480px) {
    .header {
        padding: 10px 12px;
    }

    .logo {
        font-size: 1.1rem;
    }

    .chat-area {
        padding: 12px;
        gap: 12px;
    }

    .chat-bubble {
        max-width: 92%;
    }

    .bubble-content {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    .input-area {
        padding: 8px 12px;
        padding-bottom: max(8px, env(safe-area-inset-bottom));
    }

    .input-container {
        padding: 6px 10px;
        border-radius: 10px;
    }

    .message-input {
        font-size: 0.9rem;
    }

    .btn-send, .btn-icon {
        width: 36px;
        height: 36px;
    }

    .settings-panel {
        width: 100vw;
        max-width: 100vw;
    }
}

@media (min-width: 768px) {
    .chat-area {
        padding: 24px 32px;
    }

    .chat-bubble {
        max-width: 70%;
    }
}

@media (min-width: 1024px) {
    .chat-area {
        padding: 24px 64px;
    }

    .chat-bubble {
        max-width: 60%;
    }

    .input-area {
        padding: 16px 64px;
    }
}