/* ==========================================
   PAGE LOAD ANIMATIONS
   ========================================== */

.navbar {
    opacity: 1;
}

/* ==========================================
   HOME PAGE
   ========================================== */

.home-page .home-hero-left {
    opacity: 0;
    animation: anim-slideRight 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.1s forwards;
}

.home-page .home-hero-right {
    opacity: 0;
    animation: anim-slideLeft 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.2s forwards;
}

.home-page .feature-card {
    opacity: 0;
    animation: anim-slideUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.home-page .feature-card:nth-child(1) { animation-delay: 0.4s; }
.home-page .feature-card:nth-child(2) { animation-delay: 0.5s; }
.home-page .feature-card:nth-child(3) { animation-delay: 0.6s; }
.home-page .feature-card:nth-child(4) { animation-delay: 0.7s; }

/* ==========================================
   FLASHCARDS PAGE
   ========================================== */

.flashcards-page .set-section {
    opacity: 0;
    animation: anim-slideUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) 0.15s forwards;
}

.flashcards-page .flashcard.initial-load {
    opacity: 0;
    animation: anim-fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.35s forwards;
}

.flashcards-page .flashcard {
    opacity: 1;
}

.flashcards-page #prev-btn {
    opacity: 0;
    animation: anim-slideRight 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}

.flashcards-page #next-btn {
    opacity: 0;
    animation: anim-slideLeft 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}

.flashcards-page .progress-wrapper {
    opacity: 0;
    animation: anim-slideUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.5s forwards;
}

.flashcards-page .language-toggle-container {
    opacity: 0;
    animation: anim-fadeInSlow 1s cubic-bezier(0.4, 0, 0.2, 1) 0.7s forwards;
}

@keyframes anim-fadeInSlow {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ==========================================
   FLASHCARD NAVIGATION ANIMATIONS
   ========================================== */

.flashcard.slide-out-left {
    animation: slideOutLeft 300ms ease-out forwards;
}

.flashcard.slide-out-right {
    animation: slideOutRight 300ms ease-out forwards;
}

.flashcard.slide-in-left {
    animation: slideInLeft 300ms ease-out forwards;
}

.flashcard.slide-in-right {
    animation: slideInRight 300ms ease-out forwards;
}

.flashcard.set-change-out {
    animation: setChangeOut 250ms ease-out forwards;
}

.flashcard.set-change-in {
    animation: setChangeIn 250ms ease-out forwards;
}

/* ==========================================
   QUIZ PAGE
   ========================================== */

.quiz-page .quiz-set-row {
    opacity: 0;
    animation: anim-slideUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.2s forwards;
}

.quiz-page .quiz-question-compact.initial-load {
    opacity: 0;
    animation: anim-fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.35s forwards;
}

.quiz-page .quiz-question-compact {
    opacity: 1;
}

.quiz-page .quiz-answer-section {
    opacity: 0;
    animation: anim-slideUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.45s forwards;
}

.quiz-page .quiz-status-bar {
    opacity: 0;
    animation: anim-slideUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.55s forwards;
}

/* ==========================================
   LIBRARY/EDIT PAGE
   ========================================== */

.edit-page .page-header {
    opacity: 0;
    animation: anim-slideUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) 0.1s forwards;
}

.edit-page .set-section {
    opacity: 0;
    animation: anim-slideUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.2s forwards;
}

.edit-page .action-bar {
    opacity: 0;
    animation: anim-fadeIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.3s forwards;
}

.edit-page .action-bar-left {
    opacity: 0;
    animation: anim-slideRight 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.35s forwards;
}

.edit-page .action-bar-right {
    opacity: 0;
    animation: anim-slideLeft 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.35s forwards;
}

.edit-page .cards-grid {
    opacity: 0;
    animation: anim-fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}

.edit-page.loaded .page-header,
.edit-page.loaded .set-section,
.edit-page.loaded .action-bar,
.edit-page.loaded .action-bar-left,
.edit-page.loaded .action-bar-right,
.edit-page.loaded .cards-grid {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
}

.edit-page.loaded .card-item {
    opacity: 1;
    transform: none;
}

.edit-page.loaded .card-item.animate-in {
    opacity: 0;
    transform: scale(0.95) translateY(20px);
    animation: cardAnimateIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* ==========================================
   ABOUT PAGE
   ========================================== */

.about-page .back-link {
    opacity: 0;
    animation: anim-slideRight 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.1s forwards;
}

.about-page .about-header {
    opacity: 0;
    animation: anim-slideUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) 0.15s forwards;
}

.about-page .about-content {
    opacity: 0;
    animation: anim-slideUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) 0.25s forwards;
}

/* ==========================================
   KEYFRAMES - PAGE LOAD
   ========================================== */

@keyframes anim-slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes anim-slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes anim-slideLeft {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes anim-slideRight {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes anim-scaleUp {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes anim-fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes cardAnimateIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* ==========================================
   KEYFRAMES - FLASHCARD NAVIGATION
   ========================================== */

@keyframes slideOutLeft {
    0% {
        opacity: 1;
        transform: translateX(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-60px);
    }
}

@keyframes slideOutRight {
    0% {
        opacity: 1;
        transform: translateX(0);
    }
    100% {
        opacity: 0;
        transform: translateX(60px);
    }
}

@keyframes slideInLeft {
    0% {
        opacity: 0;
        transform: translateX(60px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    0% {
        opacity: 0;
        transform: translateX(-60px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes setChangeOut {
    0% {
        opacity: 1;
        transform: scale(1);
    }
    100% {
        opacity: 0;
        transform: scale(0.92);
    }
}

@keyframes setChangeIn {
    0% {
        opacity: 0;
        transform: scale(0.92);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* ==========================================
   BUTTON HOVER ANIMATIONS
   ========================================== */

.set-btn,
.add-set-btn,
.stats-btn,
.add-card-btn,
.speak-btn,
.nav-btn,
.quiz-set-btn,
.quiz-submit-btn,
.quiz-skip-btn,
.quiz-speak-btn,
.quiz-next-btn,
.side-nav-btn,
.feature-card {
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.set-btn:hover,
.add-set-btn:hover,
.stats-btn:hover,
.quiz-set-btn:hover {
    transform: translateY(-2px);
}

.set-btn:active,
.add-set-btn:active,
.stats-btn:active,
.quiz-set-btn:active {
    transform: translateY(0) scale(0.98);
}

/* ==========================================
   ACCESSIBILITY - Reduced Motion
   ========================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .navbar,
    .home-page .home-hero-left,
    .home-page .home-hero-right,
    .home-page .feature-card,
    .flashcards-page .set-section,
    .flashcards-page .language-toggle-container,
    .flashcards-page .flashcard,
    .flashcards-page #prev-btn,
    .flashcards-page #next-btn,
    .flashcards-page .progress-wrapper,
    .quiz-page .quiz-top-bar,
    .quiz-page .quiz-set-row,
    .quiz-page .quiz-question-compact,
    .quiz-page .quiz-answer-section,
    .quiz-page .quiz-status-bar,
    .edit-page .page-header,
    .edit-page .set-section,
    .edit-page .action-bar,
    .edit-page .action-bar-left,
    .edit-page .action-bar-right,
    .edit-page .cards-grid,
    .edit-page .card-item,
    .about-page .back-link,
    .about-page .about-header,
    .about-page .about-content {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}