@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700;800&display=swap');

:root {
    --bg-color: #FFFFFF;
    --card-bg: #FFFFFF;
    --text-color: #111111;
    --text-muted: #666666;
    --accent-color: #FF5252;
    --accent-hover: #E03B3B;
    --success-color: #00B865;
    --success-bg: #EAFBF2;
    --error-color: #FF3344;
    --error-bg: #FEEFEF;
    --border-color: #111111;
    --border-light: #EBEBEB;
    --font-family: 'JetBrains Mono', ui-monospace, monospace;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --app-max-width: 460px;
    --header-height: 54px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    width: 100%;
    height: 100%;
    height: 100dvh;
    background-color: #F4F5F7;
    color: var(--text-color);
    font-family: var(--font-family);
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    -webkit-font-smoothing: antialiased;
}

input, textarea {
    -webkit-user-select: text;
    user-select: text;
    font-family: inherit;
}

button {
    font-family: inherit;
    color: inherit;
    border-radius: 0;
    -webkit-appearance: none;
    appearance: none;
}

/* CADRE TÉLÉPHONE CENTRÉ (ZÉRO OMBRE, PUR CARRÉ) */
#app-viewport {
    width: 100%;
    max-width: var(--app-max-width);
    height: 100%;
    height: 100dvh;
    margin: 0 auto;
    background-color: var(--bg-color);
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-left: 2px solid var(--border-color);
    border-right: 2px solid var(--border-color);
    box-shadow: none !important;
}

/* CANVAS PIXEL GORE */
.gore-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 180;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

/* HEADER WEB (PUR CARRÉ, ZÉRO OMBRE) */
#app-header {
    height: var(--header-height);
    min-height: var(--header-height);
    width: 100%;
    background: #FFFFFF;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    padding-top: var(--safe-top);
    z-index: 150;
    box-sizing: border-box;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-btn {
    background: none;
    border: none;
    font-size: 1.3rem;
    font-weight: 800;
    cursor: pointer;
    padding: 2px 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.1s;
}

.header-btn:hover {
    transform: translateX(-2px);
}

/* CRÉDITS MORGAN PIERREFEU DANS LE HEADER */
.header-author-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 800;
    font-size: 0.88rem;
    letter-spacing: -0.5px;
    border-bottom: 2px solid var(--text-color);
    padding-bottom: 1px;
    transition: color 0.15s, border-color 0.15s;
}

.header-author-link:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
}

.header-center {
    display: flex;
    align-items: center;
}

.stats-badge {
    display: flex;
    align-items: center;
    gap: 6px;
}

.streak-pill {
    font-size: 0.78rem;
    font-weight: 700;
    padding: 3px 8px;
    border: 2px solid var(--border-color);
    background: #FFF;
    display: inline-flex;
    align-items: center;
    gap: 3px;
    box-shadow: none !important;
}

.streak-pill.pulse {
    animation: firePulse 0.3s ease-out;
    background-color: #FFF3E0;
}

@keyframes firePulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.15); }
    100% { transform: scale(1); }
}

.level-pill {
    font-size: 0.72rem;
    font-weight: 800;
    padding: 3px 7px;
    background: var(--border-color);
    color: #FFF;
    border: 2px solid var(--border-color);
    box-shadow: none !important;
}

/* BOUTON PARTAGE (PUR CARRÉ FLAT) */
.share-cat-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 3px 8px 3px 4px;
    background: #FFF;
    border: 2px solid var(--border-color);
    cursor: pointer;
    font-size: 0.72rem;
    font-weight: 800;
    box-shadow: none !important;
    transition: background-color 0.1s;
}

.share-cat-btn:hover {
    background: #F0F0F0;
}

.share-cat-btn:active {
    background: var(--text-color);
    color: #FFF;
}

.share-cat-icon {
    width: 22px;
    height: 22px;
    object-fit: cover;
    border: 1px solid var(--border-color);
    display: block;
}

.share-label {
    letter-spacing: 0.5px;
}

/* PROGRESS BAR */
.progress-bar {
    width: 100%;
    height: 3px;
    background: #EEE;
    position: relative;
    z-index: 120;
}

.progress-fill {
    width: 0%;
    height: 100%;
    background: var(--accent-color);
    transition: width 0.25s ease-out;
}

/* ÉCRANS */
.screen {
    position: absolute;
    inset: var(--header-height) 0 0 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.hidden {
    display: none !important;
}

.visible {
    display: flex !important;
}

/* LANDING PAGE ÉPURÉE */
#landing-screen {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    background: var(--bg-color);
    padding: 1.25rem 1.25rem calc(var(--safe-bottom) + 1.5rem);
}

.landing-content {
    max-width: 100%;
    margin: 0 auto;
}

.landing-cat-section {
    display: flex;
    justify-content: center;
    margin: 1.25rem 0 1.5rem;
    cursor: pointer;
}

.landing-cat-img {
    width: 96px;
    height: auto;
    image-rendering: pixelated;
    transition: transform 0.15s;
    filter: none !important;
}

.landing-cat-img:hover {
    transform: scale(1.08);
}

/* BOUTON TOUT DOOMSCROLLER (PUR RECTANGLE FLAT) */
.quick-action-wrap {
    margin-bottom: 1.25rem;
}

.quick-all-btn {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--text-color);
    color: #FFF;
    border: 2px solid var(--border-color);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    box-shadow: none !important;
    transition: background-color 0.15s;
}

.quick-all-btn:hover {
    background: #333333;
}

.quick-all-btn:active {
    background: #555555;
}

.quick-all-arrow {
    font-size: 1.2rem;
    font-weight: 800;
}

/* LISTE DES MODULES (PUR CARRÉ FLAT) */
.category-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.category-card {
    border: 2px solid var(--border-color);
    background: var(--bg-color);
    box-shadow: none !important;
    overflow: hidden;
}

.category-header-btn {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.1rem;
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: 800;
    font-size: 0.92rem;
    text-align: left;
    transition: background-color 0.15s;
}

.category-header-btn:hover {
    background-color: #F8F8F8;
}

.cat-title-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
}

.cat-num {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 700;
}

.cat-name {
    letter-spacing: -0.3px;
}

.cat-right-badge {
    display: flex;
    align-items: center;
    gap: 8px;
}

.cat-count {
    font-size: 0.75rem;
    font-weight: 700;
    background: #F0F0F0;
    color: var(--text-color);
    padding: 2px 7px;
    border: 1px solid #CCC;
}

.cat-chevron {
    font-size: 0.8rem;
    font-weight: 800;
    transition: transform 0.2s;
}

.category-card.expanded .cat-chevron {
    transform: rotate(90deg);
}

.subcategory-dropdown {
    display: none;
    border-top: 2px solid var(--border-color);
    background: #FAFAFA;
    padding: 8px 10px;
}

.category-card.expanded .subcategory-dropdown {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.subcat-btn {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 10px;
    background: #FFF;
    border: 1.5px solid var(--border-color);
    font-size: 0.82rem;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    box-shadow: none !important;
    transition: background-color 0.1s;
}

.subcat-btn:hover {
    background: #F0F0F0;
}

.subcat-count {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* CRÉDITS FOOTER SUR LANDING */
.landing-credits-footer {
    text-align: center;
    margin-top: 2.5rem;
    padding-bottom: 1rem;
}

.landing-credits-footer a {
    color: var(--text-muted);
    font-size: 0.72rem;
    font-weight: 700;
    text-decoration: none;
    border-bottom: 1px dashed var(--text-muted);
    transition: color 0.15s, border-color 0.15s;
}

.landing-credits-footer a:hover {
    color: var(--text-color);
    border-color: var(--text-color);
}

/* FEED & CARTES (PUR FLAT) */
#feed-screen {
    position: relative;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
}

#feed {
    width: 100%;
    height: 100%;
    overflow-x: hidden;
    overflow-y: scroll;
    scroll-snap-type: y mandatory;
    scrollbar-width: none;
    -ms-overflow-style: none;
    overscroll-behavior-y: contain;
    outline: none;
}

#feed::-webkit-scrollbar {
    display: none;
}

.card {
    width: 100%;
    height: 100%;
    flex: none;
    scroll-snap-align: start;
    scroll-snap-stop: always;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 1.5rem 1.5rem calc(var(--safe-bottom) + 90px) 1.5rem;
    position: relative;
    background-color: var(--bg-color);
    border-bottom: 2px solid var(--border-color);
    overflow-y: auto;
    overflow-x: hidden;
    touch-action: pan-y;
    transition: background-color 0.2s;
    box-shadow: none !important;
}

.card.answered-ok {
    background-color: var(--success-bg);
}

.card.answered-ko {
    background-color: var(--error-bg);
}

/* BADGE CATÉGORIE */
.card-header-badge {
    position: absolute;
    top: 14px;
    left: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 10;
}

.card-type-tag {
    font-size: 0.7rem;
    font-weight: 800;
    padding: 3px 7px;
    background: var(--border-color);
    color: #FFF;
    letter-spacing: 0.5px;
}

.card-subcat-tag {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: -0.2px;
}

/* BARRE D'ACTIONS FLOTTANTE (PUR RECTANGLE / FLAT) */
.card-action-bar {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    z-index: 20;
}

.action-btn {
    width: 42px;
    height: 42px;
    background: #FFF;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: none !important;
    transition: background-color 0.1s;
}

.action-btn:hover {
    background: #F0F0F0;
}

.action-btn:active {
    background: var(--text-color);
    color: #FFF;
}

.action-btn.liked {
    background-color: #FFE5E5;
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* CONTENU DE LA CARTE */
.card-body {
    max-width: 88%;
    margin: 0 auto;
    width: 100%;
}

.card-front {
    font-size: clamp(1.15rem, 5.2vw, 1.45rem);
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: -0.5px;
    margin-bottom: 1.5rem;
    white-space: pre-wrap;
    overflow-wrap: break-word;
}

.katex-display {
    margin: 1rem 0 !important;
    padding: 6px 0;
    overflow-x: auto;
    overflow-y: hidden;
}

/* QCM CHOICES (PUR RECTANGLE FLAT) */
.qcm-choices {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 1rem;
    width: 100%;
}

.choice-btn {
    width: 100%;
    padding: 0.9rem 1.1rem;
    border: 2px solid var(--border-color);
    background: #FFF;
    color: var(--text-color);
    font-size: 0.92rem;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    box-shadow: none !important;
    transition: background-color 0.15s;
    overflow-wrap: break-word;
}

.choice-btn:hover:not(:disabled) {
    background: #F5F5F5;
}

.choice-btn:active:not(:disabled) {
    background: #EAEAEA;
}

.choice-btn.correct {
    background: var(--success-color) !important;
    color: #FFF !important;
    border-color: var(--border-color) !important;
    box-shadow: none !important;
}

.choice-btn.wrong {
    background: var(--error-color) !important;
    color: #FFF !important;
    border-color: var(--border-color) !important;
    box-shadow: none !important;
}

/* TF (VRAI / FAUX - PUR FLAT) */
.tf-actions {
    display: flex;
    gap: 12px;
    margin-top: 1.5rem;
    width: 100%;
}

.tf-btn {
    flex: 1;
    padding: 1rem;
    border: 2px solid var(--border-color);
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    cursor: pointer;
    background: #FFF;
    box-shadow: none !important;
    transition: background-color 0.15s;
}

.tf-btn.btn-faux {
    color: var(--error-color);
}

.tf-btn.btn-vrai {
    color: var(--success-color);
}

.tf-btn:hover:not(:disabled) {
    background: #F8F8F8;
}

.tf-btn:active:not(:disabled) {
    background: #EAEAEA;
}

.tf-indicator {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 3rem;
    font-weight: 800;
    opacity: 0;
    pointer-events: none;
    z-index: 30;
    transition: opacity 0.1s;
}

.tf-left {
    left: 20px;
    color: var(--error-color);
}

.tf-right {
    right: 20px;
    color: var(--success-color);
}

.tf-swipe-hint {
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 1px;
    margin-top: 10px;
    text-align: center;
}

/* BOUTON REVEAL POUR LES COURS */
.reveal-btn {
    width: 100%;
    padding: 0.8rem;
    margin-top: 1rem;
    border: 2px dashed var(--border-color);
    background: #FFF;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    box-shadow: none !important;
    transition: background-color 0.15s;
}

.reveal-btn:hover {
    background: #F5F5F5;
}

/* EXPLICATION / BACK TEXT */
.card-back {
    display: none;
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 2px dashed var(--border-color);
    font-size: 0.95rem;
    line-height: 1.5;
    color: var(--text-color);
    white-space: pre-wrap;
    animation: fadeIn 0.2s ease-out;
}

.card.revealed .card-back {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* LE PETIT CHAT EN BAS À DROITE (ZÉRO OMBRE, PUR PIXEL) */
.bottom-cat-wrap {
    position: absolute;
    bottom: calc(var(--safe-bottom) + 14px);
    right: 14px;
    z-index: 90;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    pointer-events: none;
}

.cat-speech-bubble {
    background: #FFFFFF;
    border: 2px solid var(--border-color);
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 6px;
    box-shadow: none !important;
    white-space: nowrap;
    position: relative;
    pointer-events: auto;
}

.mascot-frame {
    position: relative;
    display: inline-block;
    pointer-events: auto;
}

.mascot-cat-img {
    width: 76px;
    height: auto;
    cursor: pointer;
    display: block;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    filter: none !important;
    transition: transform 0.15s;
    user-select: none;
    -webkit-user-drag: none;
}

.mascot-cat-img:hover {
    transform: scale(1.08);
}

/* ÉTATS DU CHAT */
.mascot-cat-img.state-rest {
    animation: gentleBreathe 2.4s ease-in-out infinite;
}

@keyframes gentleBreathe {
    0%, 100% { transform: scale(1) translateY(0); }
    50% { transform: scale(1.02, 0.98) translateY(1px); }
}

.mascot-cat-img.state-transition {
    transform: scale(1.06, 1.1) translateY(-4px);
}

.mascot-cat-img.state-stand {
    transform: scale(1.1) translateY(-2px);
}

.mascot-cat-img.state-clap {
    animation: jumpAndClap 0.5s ease-in-out infinite alternate;
}

@keyframes jumpAndClap {
    0% { transform: scale(1.15) translateY(-6px); }
    100% { transform: scale(1.25) translateY(-18px) rotate(-3deg); }
}

.mascot-cat-img.state-angry {
    filter: saturate(2.5) hue-rotate(-20deg) contrast(1.3) !important;
    animation: catRageShake 0.15s ease-in-out infinite;
}

@keyframes catRageShake {
    0%, 100% { transform: scale(1.15) translate(0, 0); }
    25% { transform: scale(1.15) translate(-4px, 2px) rotate(-4deg); }
    75% { transform: scale(1.15) translate(4px, -2px) rotate(4deg); }
}

.mascot-cat-img.state-overheat {
    filter: saturate(3.5) brightness(1.2) !important;
    animation: severeOverheat 0.08s ease-in-out infinite;
}

@keyframes severeOverheat {
    0%, 100% { transform: scale(1.2) translate(-3px, 3px); }
    50% { transform: scale(1.24) translate(3px, -3px); }
}

.mascot-cat-img.state-hidden {
    opacity: 0 !important;
    pointer-events: none !important;
}

/* SCREEN SHAKE */
.viewport-screen-shake {
    animation: screenShake 0.45s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

@keyframes screenShake {
    10%, 90% { transform: translate3d(-2px, 0, 0); }
    20%, 80% { transform: translate3d(3px, -2px, 0); }
    30%, 50%, 70% { transform: translate3d(-5px, 3px, 0); }
    40%, 60% { transform: translate3d(5px, -3px, 0); }
}

/* LIKE ANIMATION */
#like-animation {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    font-size: 6rem;
    opacity: 0;
    pointer-events: none;
    z-index: 200;
}

.like-active {
    animation: pulseHeart 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes pulseHeart {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.25); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1.4); opacity: 0; }
}

/* DESKTOP NAV HINTS */
.desktop-nav-hint {
    position: absolute;
    bottom: 12px;
    left: 16px;
    display: flex;
    gap: 10px;
    font-size: 0.68rem;
    color: #999;
    font-weight: 600;
    pointer-events: none;
    z-index: 10;
}

/* MODAL DOSSIERS (PUR FLAT) */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 300;
    display: flex;
    align-items: flex-end;
}

.modal-content {
    background: var(--bg-color);
    width: 100%;
    max-width: var(--app-max-width);
    margin: 0 auto;
    max-height: 75%;
    overflow-y: auto;
    padding: 1.5rem 1.5rem calc(1.5rem + var(--safe-bottom));
    border-top: 3px solid var(--border-color);
    box-shadow: none !important;
    animation: slideUp 0.2s ease-out;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.modal-header h3 {
    font-size: 1rem;
    font-weight: 800;
}

.modal-close-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    font-weight: 800;
}

.folder-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 1.25rem;
}

.folder-item-btn {
    width: 100%;
    padding: 0.9rem;
    text-align: left;
    background: #FFF;
    border: 2px solid var(--border-color);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    box-shadow: none !important;
    transition: background-color 0.1s;
}

.folder-item-btn:hover {
    background: #F0F0F0;
}

.new-folder-row {
    display: flex;
    gap: 8px;
    margin-bottom: 1.25rem;
}

.new-folder-row input {
    flex: 1;
    padding: 0.8rem 1rem;
    border: 2px solid var(--border-color);
    font-size: 16px;
    border-radius: 0;
    box-shadow: none !important;
}

.new-folder-btn {
    padding: 0.8rem 1.2rem;
    background: var(--border-color);
    color: #FFF;
    border: none;
    font-weight: 800;
    cursor: pointer;
    box-shadow: none !important;
}

.modal-done-btn {
    width: 100%;
    padding: 0.9rem;
    background: #FFF;
    border: 2px solid var(--border-color);
    font-weight: 800;
    cursor: pointer;
    box-shadow: none !important;
}

/* TOAST (FLAT) */
.toast {
    position: absolute;
    bottom: calc(var(--safe-bottom) + 90px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--border-color);
    color: #FFF;
    padding: 8px 18px;
    font-size: 0.8rem;
    font-weight: 700;
    z-index: 250;
    box-shadow: none !important;
    border: 1px solid var(--border-color);
    pointer-events: none;
    white-space: nowrap;
}

/* RESPONSIVE MOBILE */
@media (max-width: 460px) {
    #app-viewport {
        border-left: none;
        border-right: none;
    }
    .desktop-nav-hint {
        display: none;
    }
    .card-body {
        max-width: 86%;
    }
}