/* ========================================
   EXPLAIN MY CODE — STYLES
   Dark theme, glassmorphism, neon accents
   ======================================== */

/* --- CSS Variables / Design Tokens --- */
:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.6);
    --bg-card-hover: rgba(17, 24, 39, 0.8);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-cyan: #06d6a0;
    --accent-purple: #a855f7;
    --accent-blue: #3b82f6;
    --accent-pink: #ec4899;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;

    --glow-cyan: 0 0 20px rgba(6, 214, 160, 0.3);
    --glow-purple: 0 0 20px rgba(168, 85, 247, 0.3);
    --glow-blue: 0 0 20px rgba(59, 130, 246, 0.3);

    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Accessibility Focus Indicator */
*:focus-visible {
    outline: 2px solid var(--accent-purple);
    outline-offset: 3px;
}


/* --- Animated Background Orbs --- */
.bg-orbs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-purple), transparent 70%);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, var(--accent-cyan), transparent 70%);
    bottom: -50px;
    left: -100px;
    animation-delay: -7s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, var(--accent-blue), transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -40px) scale(1.1); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(40px, 30px) scale(1.05); }
}

/* --- Glass Card --- */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

/* --- Header --- */
#app-header {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 40px 20px 20px;
}

.header-content {
    max-width: 700px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-bottom: 8px;
    cursor: default;
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: translateY(-2px);
}


.logo-icon {
    font-size: 2.4rem;
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { filter: drop-shadow(0 0 8px rgba(6, 214, 160, 0.4)); transform: scale(1); }
    50% { filter: drop-shadow(0 0 20px rgba(168, 85, 247, 0.6)); transform: scale(1.1); }
}

.logo h1 {
    font-size: 2.2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-blue));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 0.3px;
}

.header-status-wrapper {
    margin-top: 14px;
}

.api-status-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-family: var(--font-sans);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    backdrop-filter: blur(10px);
}

.api-status-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-orange);
    box-shadow: 0 0 8px var(--accent-orange);
}

.api-status-btn.connected .status-dot {
    background: var(--accent-cyan);
    box-shadow: 0 0 8px var(--accent-cyan);
}

/* --- Main Content --- */
#app-main {
    position: relative;
    z-index: 10;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 20px 40px;
}

/* --- Mode Selector Tabs --- */
.mode-selector {
    display: flex;
    gap: 8px;
    padding: 6px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    margin-bottom: 12px;
    overflow-x: auto;
    scrollbar-width: none;
}

.mode-selector::-webkit-scrollbar {
    display: none;
}

.mode-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 16px;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    position: relative;
}

.mode-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.mode-tab.active {
    background: linear-gradient(135deg, rgba(6, 214, 160, 0.15), rgba(168, 85, 247, 0.15));
    color: var(--text-primary);
    box-shadow: 0 0 16px rgba(6, 214, 160, 0.15);
    border: 1px solid rgba(6, 214, 160, 0.2);
}

.tab-icon {
    font-size: 1.1rem;
}

.tab-label {
    font-weight: 600;
}

/* --- Mode Description --- */
.mode-description {
    text-align: center;
    margin-bottom: 20px;
    padding: 0 10px;
}

.mode-description p {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-style: italic;
}

/* --- Input Section --- */
.input-section {
    padding: 20px;
    margin-bottom: 16px;
    transition: border-color var(--transition-base);
}

.input-section:focus-within {
    border-color: rgba(6, 214, 160, 0.3);
    box-shadow: var(--glass-shadow), 0 0 30px rgba(6, 214, 160, 0.08);
}

.input-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.input-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.input-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

#language-select {
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    cursor: pointer;
    outline: none;
    transition: all var(--transition-fast);
}

#language-select:hover,
#language-select:focus {
    border-color: var(--accent-cyan);
    background: rgba(255, 255, 255, 0.1);
}

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

.btn-icon {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-cyan);
    transform: scale(1.05);
}

/* --- Code Textarea --- */
.code-input-wrapper {
    position: relative;
    margin-bottom: 14px;
}

#code-input {
    width: 100%;
    min-height: 200px;
    max-height: 400px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    color: var(--accent-cyan);
    font-family: var(--font-mono);
    font-size: 0.88rem;
    line-height: 1.7;
    resize: vertical;
    outline: none;
    transition: all var(--transition-base);
    tab-size: 4;
}

#code-input::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

#code-input:focus {
    border-color: rgba(6, 214, 160, 0.3);
    box-shadow: inset 0 0 20px rgba(6, 214, 160, 0.03);
}

/* --- Input Footer --- */
.input-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.char-count {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

#char-count.exceeded {
    color: var(--accent-red);
    font-weight: 600;
    text-shadow: 0 0 8px rgba(239, 68, 68, 0.3);
    transition: color var(--transition-fast);
}

/* --- Explain Button --- */
.btn-explain {
    padding: 12px 32px;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: #fff;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.3px;
}

.btn-explain::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s;
}

.btn-explain:hover::before {
    transform: translateX(100%);
}

.btn-explain:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(6, 214, 160, 0.3), 0 2px 10px rgba(168, 85, 247, 0.2);
}

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

.btn-explain:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-explain:disabled:hover::before {
    transform: translateX(-100%);
}

/* --- Spinner --- */
.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* --- Examples --- */
.examples-section {
    margin-bottom: 20px;
    padding: 0 4px;
}

.examples-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.example-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.example-chip {
    padding: 8px 16px;
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    background: var(--glass-bg);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    backdrop-filter: blur(8px);
}

.example-chip:hover {
    background: rgba(6, 214, 160, 0.1);
    border-color: rgba(6, 214, 160, 0.3);
    color: var(--accent-cyan);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 4px 15px rgba(6, 214, 160, 0.15);
}

/* --- Output Section --- */
.output-section {
    padding: 24px;
    animation: slide-up 0.5s ease-out;
}

@keyframes slide-up {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--glass-border);
}

.output-header h2 {
    font-size: 1.1rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.output-content {
    line-height: 1.8;
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* --- Output Markdown Styling --- */
.output-content h1,
.output-content h2,
.output-content h3 {
    color: var(--accent-cyan);
    margin: 20px 0 10px;
    font-weight: 700;
}

.output-content h1 { font-size: 1.3rem; }
.output-content h2 { font-size: 1.15rem; }
.output-content h3 { font-size: 1.05rem; }

.output-content p {
    margin-bottom: 12px;
}

.output-content ul,
.output-content ol {
    margin: 10px 0 10px 20px;
}

.output-content li {
    margin-bottom: 6px;
}

.output-content code {
    background: rgba(6, 214, 160, 0.1);
    color: var(--accent-cyan);
    padding: 2px 7px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85em;
    border: 1px solid rgba(6, 214, 160, 0.15);
}

.output-content pre {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 16px;
    overflow-x: auto;
    margin: 14px 0;
}

.output-content pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.output-content strong {
    color: var(--accent-purple);
    font-weight: 600;
}

.output-content em {
    color: var(--text-secondary);
}

.output-content blockquote {
    border-left: 3px solid var(--accent-purple);
    padding: 10px 16px;
    margin: 14px 0;
    background: rgba(168, 85, 247, 0.05);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
}

/* --- Concept Badges --- */
.concept-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin: 2px 3px;
}

.concept-badge.loop {
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent-orange);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.concept-badge.function {
    background: rgba(168, 85, 247, 0.15);
    color: var(--accent-purple);
    border: 1px solid rgba(168, 85, 247, 0.2);
}

.concept-badge.variable {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.concept-badge.conditional {
    background: rgba(236, 72, 153, 0.15);
    color: var(--accent-pink);
    border: 1px solid rgba(236, 72, 153, 0.2);
}

/* --- Typing Animation --- */
.typing-cursor {
    display: inline-block;
    width: 2px;
    height: 1.1em;
    background: var(--accent-cyan);
    margin-left: 2px;
    animation: blink 0.8s step-end infinite;
    vertical-align: text-bottom;
}

@keyframes blink {
    50% { opacity: 0; }
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: fade-in 0.3s ease-out;
}

@keyframes fade-in {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    position: relative;
    width: 100%;
    max-width: 480px;
    padding: 34px 28px 28px;
    text-align: center;
}

.modal-close-btn {
    position: absolute;
    top: 14px;
    right: 16px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close-btn:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--accent-red);
}

.modal h2 {
    font-size: 1.4rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.modal p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 18px;
}

.modal-sub {
    font-size: 0.86rem !important;
    line-height: 1.5;
    color: var(--text-secondary) !important;
    margin-bottom: 18px !important;
}

.modal a {
    color: var(--accent-cyan);
    text-decoration: none;
    font-weight: 600;
}

.modal a:hover {
    text-decoration: underline;
}

#api-key-input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    outline: none;
    margin-bottom: 16px;
    transition: border-color var(--transition-fast);
}

#api-key-input:focus {
    border-color: var(--accent-cyan);
}

.modal-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 14px;
}

.btn-save-key {
    width: 100%;
    padding: 13px;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.96rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-save-key:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(6, 214, 160, 0.3);
}

.btn-demo-mode {
    width: 100%;
    padding: 11px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-demo-mode:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-color: var(--accent-purple);
}

.key-note {
    font-size: 0.78rem !important;
    color: var(--text-muted) !important;
}

/* --- Footer --- */
#app-footer {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 30px 20px 40px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

#app-footer strong {
    color: var(--text-secondary);
}

.footer-links {
    margin-top: 10px;
}

.btn-link {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: var(--font-sans);
    cursor: pointer;
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.btn-link:hover {
    color: var(--accent-cyan);
}


/* --- Toast Notification --- */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 500;
    z-index: 2000;
    opacity: 0;
    transition: all var(--transition-base);
    backdrop-filter: blur(12px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* --- Responsive --- */
@media (max-width: 640px) {
    .logo h1 {
        font-size: 1.6rem;
    }

    .logo-icon {
        font-size: 1.8rem;
    }

    .tagline {
        font-size: 0.85rem;
    }

    .mode-selector {
        gap: 4px;
        padding: 4px;
    }

    .mode-tab {
        padding: 10px 8px;
        flex-direction: column;
        gap: 3px;
        min-width: 60px;
    }

    .tab-label {
        font-size: 0.7rem;
    }

    .tab-icon {
        font-size: 1.2rem;
    }

    .input-section {
        padding: 16px;
    }

    .input-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .input-actions {
        width: 100%;
    }

    #language-select {
        flex: 1;
    }

    #code-input {
        min-height: 160px;
        font-size: 0.82rem;
    }

    .btn-explain {
        width: 100%;
        padding: 14px;
    }

    .input-footer {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
    }

    .char-count {
        text-align: center;
    }

    .example-chips {
        justify-content: center;
    }

    .output-section {
        padding: 18px;
    }
}

@media (max-width: 400px) {
    #app-header {
        padding: 30px 16px 16px;
    }

    #app-main {
        padding: 16px 12px 30px;
    }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: rgba(6, 214, 160, 0.25);
    border-radius: 10px;
    border: 1px solid rgba(6, 214, 160, 0.1);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(6, 214, 160, 0.45);
}

/* Firefox support for custom scrollbars */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(6, 214, 160, 0.25) rgba(0, 0, 0, 0.2);
}

/* --- Selection Color --- */
::selection {
    background: rgba(6, 214, 160, 0.3);
    color: #fff;
}