/* Layout - 무채색 전문적 스타일 */
* { box-sizing: border-box; }

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.app {
    max-width: 480px;
    margin: 0 auto;
    min-height: 100vh;
    background: var(--color-bg-primary);
    position: relative;
    box-shadow: var(--shadow-lg);
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: calc(12px + var(--safe-top)) 16px 12px;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
}

.header-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all 0.2s;
}
.header-btn:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.header-actions {
    display: flex;
    gap: 4px;
}

/* Balance */
.balance-display {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-primary);
}
.balance-display .material-icons {
    font-size: 16px;
    color: var(--color-text-secondary);
}

/* Main Screen */
.main-screen {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Bottom Nav */
.bottom-nav {
    display: flex;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-primary);
    padding-bottom: var(--safe-bottom);
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 10px 0;
    border: none;
    background: transparent;
    color: var(--color-text-tertiary);
    font-size: 10px;
    cursor: pointer;
    transition: color 0.2s;
}
.nav-item .material-icons {
    font-size: 22px;
}
.nav-item.active,
.nav-item:hover {
    color: var(--color-text-primary);
}

/* 모바일 safe area 대응 (안드로이드 하단 네비게이션 바) */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .bottom-nav {
        padding-bottom: env(safe-area-inset-bottom);
    }
    .chat-input-area {
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
    }
    .ai-modal-input-area {
        padding-bottom: calc(12px + env(safe-area-inset-bottom));
    }
}

/* 안드로이드 폰 대응 (safe-area가 없는 경우) */
@media screen and (max-width: 768px) and (hover: none) and (pointer: coarse) {
    .bottom-nav {
        padding-bottom: 20px;
    }
    .chat-input-area {
        padding-bottom: 24px;
    }
    .ai-modal-input-area {
        padding-bottom: 24px;
    }
    .messages {
        padding-bottom: 100px;
    }
    .conversation-list {
        padding-bottom: 140px;
    }
}

/* 안드로이드 모바일 하단 바 대응 - 고정값 */
@media screen and (max-width: 768px) {
    .bottom-nav {
        padding-bottom: 48px !important;
    }
    .conversation-list {
        padding-bottom: 160px !important;
    }
}