/* AIVOCA 2.0 - App Shell CSS */
/* Mobile-first app layout: header + content + bottom tab bar */

/* ===== App Body ===== */
.app-body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 0;
    padding: 0;
    background: var(--bg-secondary);
    min-height: 100vh;
    -webkit-tap-highlight-color: transparent;
    -webkit-text-size-adjust: 100%;
    overscroll-behavior-y: contain;
}

/* Safe area for notch devices */
@supports (padding: env(safe-area-inset-top)) {
    .app-body {
        padding-top: env(safe-area-inset-top);
    }
}

/* ===== App Header (40px mini) ===== */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
    padding: 0 1rem;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
}

.app-header--gradient {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-bottom: none;
}

.app-header--gradient .app-header__logo-text,
.app-header--gradient .app-header__btn {
    color: white;
}

.app-header__logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--primary);
}

.app-header__logo-icon {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 0.375rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.875rem;
}

.app-header__logo-text {
    font-size: 1rem;
    font-weight: 800;
    color: var(--primary);
}

.app-header__actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.app-header__btn {
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.app-header__btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* ===== Main Content ===== */
.app-main {
    padding-bottom: calc(64px + env(safe-area-inset-bottom, 0px));
    min-height: calc(100vh - 48px);
}

.app-body[data-fullscreen="true"] .app-main {
    padding-bottom: 0;
    min-height: 100vh;
}

/* ===== Bottom Tab Bar ===== */
.tab-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: calc(64px + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.tab-bar__item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 64px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.65rem;
    font-weight: 500;
    gap: 0.2rem;
    transition: color 0.15s ease;
    position: relative;
}

.tab-bar__item i {
    font-size: 1.35rem;
    line-height: 1;
}

.tab-bar__item--active {
    color: var(--primary);
    font-weight: 700;
}

.tab-bar__item--active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 32px;
    height: 2px;
    background: var(--primary);
    border-radius: 0 0 2px 2px;
}

/* Center CTA button (elevated play button) */
.tab-bar__item--cta {
    position: relative;
    color: white;
}

.tab-bar__cta-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-top: -16px;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
    transition: transform 0.2s ease;
}

.tab-bar__item--cta span {
    color: var(--primary);
    font-weight: 700;
}

.tab-bar__item--cta:active .tab-bar__cta-icon {
    transform: scale(0.92);
}

/* ===== PWA Install Banner ===== */
.pwa-install-banner {
    position: fixed;
    bottom: calc(72px + env(safe-area-inset-bottom, 0px));
    left: 0.75rem;
    right: 0.75rem;
    z-index: 300;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 0.875rem 1rem;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    animation: slideUp 0.3s ease;
}

.pwa-install-banner__content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
    min-width: 0;
}

.pwa-install-banner__icon {
    width: 40px;
    height: 40px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--primary);
    flex-shrink: 0;
}

.pwa-install-banner__text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.pwa-install-banner__text strong {
    font-size: 0.85rem;
    font-weight: 700;
}

.pwa-install-banner__text small {
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pwa-install-banner__actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.pwa-install-banner__dismiss {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.75rem;
    cursor: pointer;
    padding: 0.35rem;
}

.pwa-install-banner__install {
    white-space: nowrap;
}

/* ===== Page Sections (for app-style pages) ===== */
.app-section {
    padding: 1rem;
}

.app-section__title {
    font-size: 1rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.app-section__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.app-section__more {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
}

/* ===== Today Study CTA Card ===== */
.today-cta {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--radius-xl);
    padding: 1.25rem;
    color: white;
    margin: 1rem;
}

.today-cta__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.today-cta__greeting {
    font-size: 0.85rem;
    opacity: 0.9;
}

.today-cta__streak {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: rgba(255,255,255,0.2);
    padding: 0.3rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.today-cta__title {
    font-size: 1.35rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
}

.today-cta__subtitle {
    font-size: 0.8rem;
    opacity: 0.85;
    margin-bottom: 1rem;
}

.today-cta__stats {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.today-cta__stat {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    background: rgba(255,255,255,0.15);
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.8rem;
    font-weight: 600;
}

.today-cta__btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.875rem;
    background: white;
    color: var(--primary);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    transition: transform 0.15s ease;
}

.today-cta__btn:active {
    transform: scale(0.97);
}

/* ===== Study Mode Grid (2x2) ===== */
.mode-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    padding: 0 1rem;
}

.mode-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.25rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
}

.mode-card:active {
    transform: scale(0.96);
    background: var(--bg-tertiary);
}

.mode-card__icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
}

.mode-card__icon--flash { background: rgba(99, 102, 241, 0.1); color: var(--primary); }
.mode-card__icon--quiz { background: rgba(236, 72, 153, 0.1); color: #ec4899; }
.mode-card__icon--listen { background: rgba(20, 184, 166, 0.1); color: #14b8a6; }
.mode-card__icon--type { background: rgba(245, 158, 11, 0.1); color: #f59e0b; }

.mode-card__name {
    font-size: 0.85rem;
    font-weight: 700;
}

/* ===== Weekly Calendar Strip ===== */
.week-strip {
    display: flex;
    justify-content: space-between;
    padding: 0 1rem;
    gap: 0.25rem;
}

.week-strip__day {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 0;
}

.week-strip__label {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-weight: 500;
}

.week-strip__dot {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.week-strip__dot--done {
    background: var(--success);
    color: white;
}

.week-strip__dot--today {
    border: 2px solid var(--primary);
    color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}

.week-strip__dot--today.week-strip__dot--done {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===== XP Level Bar (compact) ===== */
.xp-compact {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    margin: 0 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.xp-compact__level {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--primary);
    white-space: nowrap;
}

.xp-compact__bar {
    flex: 1;
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.xp-compact__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.xp-compact__text {
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* ===== Tablet+ Adjustments ===== */
@media (min-width: 768px) {
    .app-main {
        max-width: 480px;
        margin: 0 auto;
    }

    .tab-bar {
        max-width: 480px;
        left: 50%;
        transform: translateX(-50%);
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    }

    .pwa-install-banner {
        max-width: 460px;
        left: 50%;
        transform: translateX(-50%);
    }

    .app-header {
        max-width: 480px;
        margin: 0 auto;
    }
}