/* ============================================================
   FlashCard App — Main Stylesheet
   Direction : RTL | Mobile-First | Persian font
   ============================================================ */

/* ── Reset & Variables ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --clr-bg:        #0f172a;   /* dark navy background */
    --clr-surface:   #1e293b;   /* card / panel surface */
    --clr-surface2:  #293548;   /* slightly lighter surface */
    --clr-border:    #334155;
    --clr-accent:    #38bdf8;   /* sky blue accent */
    --clr-accent2:   #818cf8;   /* indigo secondary accent */
    --clr-text:      #f1f5f9;   /* main text */
    --clr-text-dim:  #94a3b8;   /* dimmed text */
    --clr-danger:    #f87171;
    --clr-success:   #4ade80;
    --clr-warning:   #facc15;
    --clr-star:      #facc15;
    --radius:        16px;
    --radius-sm:     10px;
    --shadow:        0 4px 24px rgba(0,0,0,.4);
    --shadow-sm:     0 2px 8px  rgba(0,0,0,.3);
    --font:          'Vazirmatn', sans-serif;
    --transition:    .25s cubic-bezier(.4,0,.2,1);
}

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font);
    background: var(--clr-bg);
    color: var(--clr-text);
    min-height: 100vh;
    direction: rtl;
    text-align: right;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }

/* ── Flash Messages ────────────────────────────────────────── */
.flash {
    position: fixed; top: 16px; left: 50%; transform: translateX(-50%);
    z-index: 9999; padding: 12px 24px; border-radius: var(--radius-sm);
    font-size: .88rem; font-weight: 600; white-space: nowrap;
    animation: slideDown .3s var(--transition);
    box-shadow: var(--shadow-sm);
}
.flash-success { background: #166534; color: #86efac; }
.flash-error   { background: #991b1b; color: #fca5a5; }
.flash-info    { background: #1d4ed8; color: #93c5fd; }
@keyframes slideDown {
    from { top: -60px; opacity: 0; }
    to   { top: 16px;  opacity: 1; }
}

/* ── Navbar ────────────────────────────────────────────────── */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(15,23,42,.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--clr-border);
    padding: 0 12px; height: 56px;
}
.navbar-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 100%; max-width: 600px; margin: 0 auto; width: 100%;
}
.nav-title {
    font-size: 1rem; font-weight: 700; color: var(--clr-text);
    flex: 1; text-align: center; white-space: nowrap; overflow: hidden;
    text-overflow: ellipsis; padding: 0 8px;
}
.nav-btn {
    width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
    border-radius: 50%; transition: background var(--transition);
    flex-shrink: 0;
}
.nav-btn:hover { background: var(--clr-surface2); }
.nav-btn svg { width: 20px; height: 20px; stroke: var(--clr-text-dim); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* ── Auth Pages (login / register) ─────────────────────────── */
.auth-wrap {
    min-height: 100vh; display: flex; flex-direction: column;
    align-items: center; justify-content: center; padding: 32px 20px;
    background: linear-gradient(145deg, #0f172a 0%, #1e1b4b 100%);
}
.auth-logo {
    font-size: 2.6rem; margin-bottom: 8px; text-align: center;
}
.auth-logo span { display: block; font-size: .9rem; color: var(--clr-text-dim); font-weight: 400; margin-top: 4px; }
.auth-card {
    width: 100%; max-width: 380px;
    background: var(--clr-surface); border-radius: var(--radius);
    padding: 32px 24px; box-shadow: var(--shadow);
}
.auth-card h2 { font-size: 1.3rem; margin-bottom: 24px; text-align: center; color: var(--clr-accent); }

.form-group { margin-bottom: 18px; }
.form-group label {
    display: block; font-size: .82rem; color: var(--clr-text-dim);
    margin-bottom: 6px; font-weight: 500;
}
.form-group input, .form-group textarea {
    width: 100%; padding: 10px 14px; border-radius: var(--radius-sm);
    border: 1px solid var(--clr-border); background: var(--clr-bg);
    color: var(--clr-text); font-size: .92rem; transition: border var(--transition);
    outline: none;
}
.form-group input:focus, .form-group textarea:focus { border-color: var(--clr-accent); }
.form-group textarea { resize: vertical; min-height: 80px; }

.btn-primary {
    width: 100%; padding: 12px; border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent2));
    color: #0f172a; font-size: .95rem; font-weight: 700;
    transition: opacity var(--transition), transform var(--transition);
}
.btn-primary:active { transform: scale(.97); }
.btn-primary:hover  { opacity: .9; }

.auth-footer { margin-top: 20px; text-align: center; font-size: .82rem; color: var(--clr-text-dim); }
.auth-footer a { color: var(--clr-accent); font-weight: 600; }

/* ── Main Content Wrapper ──────────────────────────────────── */
.main-wrap {
    max-width: 600px; margin: 0 auto; padding: 20px 16px 100px;
    min-height: calc(100vh - 56px);
}

/* ── Grid of Items (folders / decks) ───────────────────────── */
.item-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

/* ── Item Card (folder or deck) ────────────────────────────── */
.item-card {
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    cursor: pointer;
    position: relative;
}
.item-card:active { transform: scale(.96); }
.item-card:hover  { box-shadow: var(--shadow); border-color: var(--clr-accent); }

.item-card__avatar {
    width: 100%; aspect-ratio: 1; object-fit: cover;
    background: var(--clr-surface2);
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.item-card__avatar img { width: 100%; height: 100%; object-fit: cover; }
.item-card__avatar .avatar-placeholder {
    font-size: 2.2rem; color: var(--clr-border); user-select: none;
}

.item-card__body { padding: 10px 12px 12px; }
.item-card__name { font-size: .88rem; font-weight: 600; color: var(--clr-text); word-break: break-word; }
.item-card__meta { font-size: .75rem; color: var(--clr-text-dim); margin-top: 3px; }

/* Item-card type badge */
.item-card__badge {
    position: absolute; top: 8px; left: 8px;
    background: rgba(15,23,42,.75); backdrop-filter: blur(4px);
    padding: 2px 8px; border-radius: 20px;
    font-size: .7rem; color: var(--clr-accent); font-weight: 600;
}

/* ── Add Button (floating) ─────────────────────────────────── */
.fab {
    position: fixed; bottom: 24px; left: 24px;  /* left because RTL */
    width: 56px; height: 56px; border-radius: 50%;
    background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent2));
    color: #0f172a; font-size: 1.8rem; font-weight: 300;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 16px rgba(56,189,248,.4);
    transition: transform var(--transition), box-shadow var(--transition);
    z-index: 50;
}
.fab:active { transform: scale(.9); }
.fab:hover  { box-shadow: 0 6px 24px rgba(56,189,248,.5); }

/* FAB mini menu */
.fab-menu {
    position: fixed; bottom: 90px; left: 16px; z-index: 50;
    display: flex; flex-direction: column; gap: 8px;
    opacity: 0; pointer-events: none;
    transform: translateY(12px);
    transition: opacity var(--transition), transform var(--transition);
}
.fab-menu.open { opacity: 1; pointer-events: auto; transform: translateY(0); }
.fab-menu-item {
    display: flex; align-items: center; gap: 10px;
    background: var(--clr-surface); border: 1px solid var(--clr-border);
    border-radius: 28px; padding: 8px 16px 8px 12px;
    box-shadow: var(--shadow-sm); font-size: .82rem; color: var(--clr-text);
    white-space: nowrap; cursor: pointer;
    transition: background var(--transition);
}
.fab-menu-item:hover { background: var(--clr-surface2); }
.fab-menu-item svg {
    width: 18px; height: 18px; stroke: var(--clr-accent); fill: none;
    stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0;
}

/* ── Modal ─────────────────────────────────────────────────── */
.modal-overlay {
    position: fixed; inset: 0; z-index: 200;
    background: rgba(0,0,0,.6); backdrop-filter: blur(4px);
    display: flex; align-items: flex-end; justify-content: center;
    opacity: 0; pointer-events: none;
    transition: opacity var(--transition);
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }

.modal {
    background: var(--clr-surface); border-radius: var(--radius) var(--radius) 0 0;
    width: 100%; max-width: 480px; max-height: 85vh;
    overflow-y: auto; padding: 24px 20px 32px;
    transform: translateY(100%);
    transition: transform .3s cubic-bezier(.4,0,.2,1);
    position: relative;
}
.modal-overlay.open .modal { transform: translateY(0); }

.modal__handle {
    width: 40px; height: 4px; border-radius: 2px;
    background: var(--clr-border); margin: 0 auto 20px;
}
.modal__title {
    font-size: 1.1rem; font-weight: 700; margin-bottom: 20px;
    color: var(--clr-accent); text-align: center;
}
.modal__close {
    position: absolute; top: 16px; right: 16px;
    width: 28px; height: 28px; display: flex; align-items: center; justify-content: center;
    border-radius: 50%; transition: background var(--transition);
}
.modal__close:hover { background: var(--clr-surface2); }
.modal__close svg { width: 18px; height: 18px; stroke: var(--clr-text-dim); fill: none; stroke-width: 2.5; stroke-linecap: round; }

/* color picker row */
.color-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.color-swatch {
    width: 32px; height: 32px; border-radius: 50%;
    border: 3px solid transparent;
    transition: border-color var(--transition), transform var(--transition);
    cursor: pointer;
}
.color-swatch:hover  { transform: scale(1.15); }
.color-swatch.active { border-color: #fff; }

/* avatar upload area */
.avatar-upload {
    width: 100%; aspect-ratio: 1; max-width: 140px; margin: 0 auto 16px;
    border: 2px dashed var(--clr-border); border-radius: var(--radius);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; position: relative; overflow: hidden;
    transition: border-color var(--transition);
    background: var(--clr-bg);
}
.avatar-upload:hover { border-color: var(--clr-accent); }
.avatar-upload img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.avatar-upload .upload-icon { color: var(--clr-text-dim); font-size: 1.6rem; z-index: 1; position: relative; }
.avatar-upload input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; z-index: 2; }

/* ── Empty State ───────────────────────────────────────────── */
.empty-state {
    text-align: center; padding: 60px 20px 40px;
    color: var(--clr-text-dim);
}
.empty-state__icon { font-size: 3.2rem; margin-bottom: 12px; opacity: .6; }
.empty-state__title { font-size: 1.1rem; font-weight: 600; color: var(--clr-text); margin-bottom: 6px; }
.empty-state__desc  { font-size: .82rem; line-height: 1.5; }

/* ── Breadcrumb ────────────────────────────────────────────── */
.breadcrumb {
    display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
    padding: 10px 0 4px; font-size: .78rem; color: var(--clr-text-dim);
}
.breadcrumb a { color: var(--clr-accent); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { color: var(--clr-border); }
.breadcrumb .current { color: var(--clr-text); font-weight: 500; }

/* ── Deck Header (shuffle, counter) ────────────────────────── */
.deck-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 12px 0 8px;
}
.deck-header__left { display: flex; align-items: center; gap: 10px; }
.deck-header__count { font-size: .78rem; color: var(--clr-text-dim); background: var(--clr-surface2); padding: 3px 10px; border-radius: 20px; }
.btn-icon {
    width: 36px; height: 36px; border-radius: 50%;
    border: 1px solid var(--clr-border); display: flex; align-items: center; justify-content: center;
    transition: background var(--transition), border-color var(--transition);
    background: var(--clr-surface);
}
.btn-icon:hover { background: var(--clr-surface2); border-color: var(--clr-accent); }
.btn-icon svg { width: 18px; height: 18px; stroke: var(--clr-text-dim); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn-icon.active svg { stroke: var(--clr-accent); }

/* ── Swipe Viewport ────────────────────────────────────────── */
.swipe-wrap {
    position: relative; width: 100%; overflow: hidden;
    padding: 12px 0 24px;
}
.swipe-track {
    display: flex; transition: transform .35s cubic-bezier(.4,0,.2,1);
    will-change: transform;
}
.swipe-card-slot {
    min-width: 100%; padding: 0 4px;
    display: flex; justify-content: center;
}

/* ── Flash Card (the actual card with flip) ────────────────── */
.flash-card-outer {
    width: 100%; max-width: 380px;
    perspective: 1200px;
    position: relative;
}
.flash-card {
    width: 100%; border-radius: var(--radius);
    position: relative; transform-style: preserve-3d;
    transition: transform .55s cubic-bezier(.4,0,.2,1);
    min-height: 220px;
    cursor: pointer;
}
.flash-card.flipped { transform: rotateY(180deg); }

/* front & back share the same sizing */
.flash-card__face {
    position: absolute; inset: 0; border-radius: var(--radius);
    backface-visibility: hidden; -webkit-backface-visibility: hidden;
    display: flex; flex-direction: column;
    overflow: hidden; box-shadow: var(--shadow);
}

/* ── Front face ── */
.flash-card__front {
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
}
.flash-card__img {
    width: 100%; max-height: 160px; object-fit: cover;
    flex-shrink: 0;
}
.flash-card__content {
    flex: 1; padding: 14px 16px 48px; display: flex; flex-direction: column; justify-content: center;
}
.flash-card__title    { font-size: 1.15rem; font-weight: 700; color: var(--clr-text); }
.flash-card__subtitle { font-size: .82rem; color: var(--clr-text-dim); margin-top: 4px; }
.flash-card__flip-hint {
    position: absolute; bottom: 8px; left: 50%; transform: translateX(-50%);
    font-size: .68rem; color: var(--clr-text-dim); opacity: .6;
    white-space: nowrap; pointer-events: none;
}

/* ── Back face ── */
.flash-card__back {
    background: var(--clr-surface2);
    border: 1px solid var(--clr-border);
    transform: rotateY(180deg);
    padding: 20px 16px;
    align-items: center; justify-content: center;
    text-align: center;
}
.flash-card__back-label { font-size: .7rem; color: var(--clr-text-dim); margin-bottom: 10px; text-transform: uppercase; letter-spacing: .5px; }
.flash-card__desc { font-size: .9rem; color: var(--clr-text); line-height: 1.6; }

/* ── Card Controls (star, edit, delete) ────────────────────── */
.card-ctrl-top {
    position: absolute; top: 8px; right: 8px; z-index: 2;
}
.card-ctrl-bottom {
    position: absolute; bottom: 8px; left: 8px; right: 8px;
    display: flex; justify-content: flex-end; gap: 6px; z-index: 2;
}
.card-ctrl-btn {
    width: 30px; height: 30px; border-radius: 50%;
    background: rgba(15,23,42,.7); backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    transition: background var(--transition), transform var(--transition);
}
.card-ctrl-btn:hover  { background: rgba(30,41,59,.95); transform: scale(1.1); }
.card-ctrl-btn svg    { width: 15px; height: 15px; stroke: var(--clr-text-dim); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.card-ctrl-btn.star   { }
.card-ctrl-btn.star svg.filled { fill: var(--clr-star); stroke: var(--clr-star); }
.card-ctrl-btn.danger svg { stroke: var(--clr-danger); }

/* ── Swipe Nav Buttons ─────────────────────────────────────── */
.swipe-nav {
    display: flex; align-items: center; justify-content: center; gap: 16px;
    padding: 4px 0 8px;
}
.swipe-nav-btn {
    width: 44px; height: 44px; border-radius: 50%;
    border: 1px solid var(--clr-border); background: var(--clr-surface);
    display: flex; align-items: center; justify-content: center;
    transition: background var(--transition), border-color var(--transition);
}
.swipe-nav-btn:hover { background: var(--clr-surface2); border-color: var(--clr-accent); }
.swipe-nav-btn svg  { width: 20px; height: 20px; stroke: var(--clr-text); fill: none; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }
.swipe-counter { font-size: .82rem; color: var(--clr-text-dim); min-width: 48px; text-align: center; }

/* ── Confirmation Dialog ──────────────────────────────────── */
.confirm-overlay {
    position: fixed; inset: 0; z-index: 300;
    background: rgba(0,0,0,.6);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; pointer-events: none;
    transition: opacity var(--transition);
    padding: 20px;
}
.confirm-overlay.open { opacity: 1; pointer-events: auto; }
.confirm-box {
    background: var(--clr-surface); border-radius: var(--radius);
    padding: 28px 24px; max-width: 320px; width: 100%;
    box-shadow: var(--shadow);
    transform: scale(.92);
    transition: transform .25s cubic-bezier(.4,0,.2,1);
}
.confirm-overlay.open .confirm-box { transform: scale(1); }
.confirm-box h3 { font-size: 1rem; margin-bottom: 8px; color: var(--clr-text); }
.confirm-box p  { font-size: .82rem; color: var(--clr-text-dim); margin-bottom: 20px; line-height: 1.5; }
.confirm-btns { display: flex; gap: 10px; justify-content: flex-start; }
.btn-confirm-yes {
    flex: 1; padding: 9px; border-radius: var(--radius-sm);
    background: var(--clr-danger); color: #fff; font-size: .85rem; font-weight: 600;
    transition: opacity var(--transition);
}
.btn-confirm-yes:hover { opacity: .85; }
.btn-confirm-no {
    flex: 1; padding: 9px; border-radius: var(--radius-sm);
    background: var(--clr-surface2); border: 1px solid var(--clr-border);
    color: var(--clr-text); font-size: .85rem; font-weight: 600;
    transition: background var(--transition);
}
.btn-confirm-no:hover { background: var(--clr-border); }

/* ── Responsive (tablet+) ─────────────────────────────────── */
@media (min-width: 480px) {
    .item-grid { gap: 16px; }
    .modal { border-radius: var(--radius); margin: auto; }
    .modal-overlay { align-items: center; }
}

/* ── Touch drag hint animation ─────────────────────────────── */
@keyframes swipeHint {
    0%   { transform: translateX(0); opacity: 1; }
    50%  { transform: translateX(-24px); opacity: .6; }
    100% { transform: translateX(0); opacity: 1; }
}
.swipe-hint-active { animation: swipeHint .7s ease-in-out 1.2s 2; }