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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f7f7f8;
    --text-primary: #2d2d2d;
    --text-secondary: #6e6e80;
    --border-color: #d9d9e3;
    --hover-bg: #f0f0f0;
    --input-bg: #ffffff;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.nav-container {
    max-width: 48rem;
    margin: 0 auto;
    padding: 1rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
}

.brand-name {
    font-size: 1rem;
    font-weight: 600;
}

.mobile-menu-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.375rem;
    transition: all 0.2s;
    background: var(--bg-primary);
}

.mobile-menu-btn:hover {
    background: var(--hover-bg);
}

/* Main Content */
.main {
    flex: 1;
    padding-top: 4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding-bottom: 4rem;
}

.hero-section {
    text-align: center;
    padding: 3rem 1rem 2rem;
    width: 100%;
}

.hero-title {
    font-size: 3rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

/* Examples Section */
.examples-section {
    width: 100%;
    max-width: 768px;
    padding: 0 1rem 2rem;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.example-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1rem 1rem 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.875rem;
    cursor: pointer;
    transition: all 0.15s ease;
}

.example-card:hover {
    background: var(--bg-secondary);
}

.example-card svg:first-child {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.example-card span {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.arrow-icon {
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity 0.15s ease;
}

.example-card:hover .arrow-icon {
    opacity: 1;
}

/* Input Section */
.input-section {
    width: 100%;
    max-width: 768px;
    padding: 2rem 1rem 0;
    margin-top: auto;
}

.input-container {
    width: 100%;
}

.input-wrapper {
    position: relative;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    display: flex;
    align-items: flex-end;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
}

.input-wrapper:focus-within {
    border-color: var(--text-secondary);
    box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.05);
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    padding: 0.75rem 3rem 0.75rem 1rem;
    color: var(--text-primary);
    font-size: 1rem;
    resize: none;
    min-height: 44px;
    max-height: 200px;
    line-height: 1.5;
    font-family: inherit;
}

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

.attach-button, .send-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.375rem;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.attach-button {
    position: absolute;
    left: 0.5rem;
    bottom: 0.5rem;
}

.send-button {
    position: absolute;
    right: 0.5rem;
    bottom: 0.5rem;
    color: var(--text-primary);
    opacity: 0.3;
    transition: all 0.2s;
}

.send-button:active {
    transform: scale(0.95);
}

.message-input:focus ~ .send-button,
.message-input:not(:placeholder-shown) ~ .send-button {
    opacity: 1;
}

.disclaimer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

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

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .examples-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .input-wrapper {
        box-shadow: none;
    }
}

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

    .hero-title {
        font-size: 2rem;
    }

    .message-input {
        padding: 0.75rem 2.5rem 0.75rem 0.75rem;
    }

    .attach-button {
        left: 0.25rem;
    }

    .send-button {
        right: 0.25rem;
    }
}

/* Transitions */
* {
    transition: border-color 0.2s, background-color 0.2s;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #0a0a0a;
        --bg-secondary: #111111;
        --text-primary: #ffffff;
        --text-secondary: #a1a1aa;
        --border-color: #27272a;
        --hover-bg: #1a1a1a;
    }
}