:root {
    --bg-color: #ffffff;
    --text-color: #1a1a2e;
    --accent-color: #e94560;
    --bubble-outgoing: #0084ff;
    --bubble-incoming: #e4e6eb;
    --chat-bg: #f0f2f5;
    --good-color: #16a34a;
    --bad-color: #dc2626;
    --link-color: #2563eb;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    opacity: 0;
    transition: opacity 0.3s ease, background 0.5s ease;
}

body.loaded {
    opacity: 1;
}

body.hey-mode {
    background-blend-mode: overlay;
}

/* RTL Support */
[dir="rtl"] {
    text-align: right;
}

[dir="rtl"] .message.outgoing {
    flex-direction: row-reverse;
}

[dir="rtl"] .message.incoming {
    flex-direction: row-reverse;
}

[dir="rtl"] .message.outgoing .bubble {
    border-radius: 18px 4px 18px 18px;
}

[dir="rtl"] .message.incoming .bubble {
    border-radius: 4px 18px 18px 18px;
}

.container {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
}

.title {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

#typed-word {
    color: var(--accent-color);
}

.cursor {
    animation: blink 1s step-end infinite;
    color: var(--accent-color);
}

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

.subtitle {
    font-size: 1.25rem;
    opacity: 0.8;
    margin-bottom: 1rem;
}

.intro {
    font-size: 1.1rem;
    opacity: 0.7;
    max-width: 700px;
    margin: 0 auto;
}

.intro em {
    font-style: italic;
}

/* Examples */
.example {
    margin-bottom: 3rem;
    padding: 1.5rem;
    border-radius: 12px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
}

.example h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.example.bad h2 {
    color: var(--bad-color);
}

.example.good h2 {
    color: var(--good-color);
}

/* Chat Bubbles */
.chat {
    background: var(--chat-bg);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 1.5rem;
}

.message {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.message:last-child {
    margin-bottom: 0;
}

.message.outgoing {
    flex-direction: row-reverse;
}

.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
}

.bubble {
    max-width: 70%;
    padding: 0.5rem 0.75rem;
    border-radius: 18px;
    position: relative;
}

.message.outgoing .bubble {
    background: var(--bubble-outgoing);
    color: #fff;
    border-radius: 18px 18px 4px 18px;
}

.message.incoming .bubble {
    background: var(--bubble-incoming);
    color: var(--text-color);
    border-radius: 18px 18px 18px 4px;
}

.bubble .name {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    opacity: 0.8;
    margin-bottom: 0.125rem;
}

.bubble .text {
    display: block;
    font-size: 0.95rem;
}

.bubble .time {
    display: block;
    font-size: 0.7rem;
    opacity: 0.6;
    margin-top: 0.25rem;
    text-align: right;
}

[dir="rtl"] .bubble .time {
    text-align: left;
}

/* Explanation */
.explanation {
    font-size: 1rem;
    line-height: 1.7;
}

.explanation p {
    margin-bottom: 1rem;
}

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

.explanation ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

[dir="rtl"] .explanation ul {
    padding-left: 0;
    padding-right: 1.5rem;
}

.explanation li {
    margin-bottom: 0.5rem;
}

.explanation strong {
    color: var(--accent-color);
}

.explanation a {
    color: var(--link-color);
    text-decoration: none;
}

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

/* Footer */
footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #e5e7eb;
    font-size: 0.9rem;
    opacity: 0.7;
    text-align: center;
}

footer p {
    margin-bottom: 1rem;
}

footer a {
    color: var(--link-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.languages {
    font-size: 0.85rem;
    opacity: 0.8;
}

#language-list a {
    color: var(--link-color);
}

#language-list strong {
    color: var(--accent-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem 1rem;
    }

    .example {
        padding: 1rem;
    }

    .bubble {
        max-width: 85%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 1rem 0.75rem;
    }

    .avatar {
        width: 30px;
        height: 30px;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }
}