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

:root {
    --primary-color: #007AFF;
    --bg-color: #f5f5f5;
    --chat-bg: #ffffff;
    --user-msg-bg: #007AFF;
    --user-msg-color: #ffffff;
    --assistant-msg-bg: #e9e9eb;
    --assistant-msg-color: #000000;
    --border-color: #e0e0e0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    height: 100dvh;
    overflow: hidden;
}

/* Login Page */
.login-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100dvh;
    padding: 20px;
}

.login-container h1 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.login-form {
    width: 100%;
    max-width: 300px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.login-form input {
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
}

.login-form button {
    padding: 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
}

.login-form button:hover {
    opacity: 0.9;
}

.error {
    color: #ff3b30;
    text-align: center;
    font-size: 14px;
}

.hidden {
    display: none !important;
}

/* Chat Page */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: var(--chat-bg);

    &:has(input:focus) {
        height: 100dvh;
    }
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(15px + env(safe-area-inset-top)) calc(20px + env(safe-area-inset-right)) 15px calc(20px + env(safe-area-inset-left));
    background-color: var(--primary-color);
    color: white;
    position: sticky;
    top: 0;
    z-index: 10;
}

.chat-header h1 {
    font-size: 1.2rem;
    font-weight: 600;
}

.menu-btn {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px calc(20px + env(safe-area-inset-right)) 20px calc(20px + env(safe-area-inset-left));
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 18px;
    word-wrap: break-word;
    line-height: 1.4;
}

.message.user {
    align-self: flex-end;
    background-color: var(--user-msg-bg);
    color: var(--user-msg-color);
    border-bottom-right-radius: 4px;
}

.message.assistant {
    align-self: flex-start;
    background-color: var(--assistant-msg-bg);
    color: var(--assistant-msg-color);
    border-bottom-left-radius: 4px;
}

.chat-input {
    padding: 10px 15px;
    padding: 10px calc(15px + env(safe-area-inset-right)) calc(10px + env(safe-area-inset-bottom)) calc(15px + env(safe-area-inset-left));
    background-color: var(--chat-bg);
    border-top: 1px solid var(--border-color);
    position: sticky;
    bottom: 0;

    &:has(input:focus) {
        padding-bottom: 10px;
    }
}

.chat-input form {
    display: flex;
    gap: 10px;
}

.chat-input input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 16px;
    outline: none;
}

.chat-input input:focus {
    border-color: var(--primary-color);
}

.chat-input button {
    width: 44px;
    height: 44px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
}

/* Menu Overlay */
.menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: flex-end;
    z-index: 100;
}

.menu {
    background-color: white;
    width: 250px;
    padding: 20px;
    padding: calc(20px + env(safe-area-inset-top)) calc(20px + env(safe-area-inset-right)) calc(20px + env(safe-area-inset-bottom)) calc(20px + env(safe-area-inset-left));
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
}

.menu button {
    width: 100%;
    padding: 15px;
    background-color: #ff3b30;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 12px 16px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background-color: #999;
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

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

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

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-4px);
    }
}