/* =============================================
   TaskFlow — Design System
   Aesthetic: Dark editorial with neon accents
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap');

:root {
    --bg-primary: #0f1117;
    --bg-secondary: #161822;
    --bg-column: #1a1d27;
    --bg-card: #1f2235;
    --bg-card-hover: #242840;

    --accent-todo: #6c63ff;
    --accent-progress: #f59e0b;
    --accent-review: #ec4899;
    --accent-done: #10b981;

    --priority-low: #10b981;
    --priority-medium: #f59e0b;
    --priority-high: #ef4444;

    --text-primary: #f0f0f8;
    --text-secondary: #8b8fa8;
    --text-muted: #4a4d65;

    --border-subtle: rgba(255,255,255,0.06);
    --border-card: rgba(255,255,255,0.08);

    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 24px;

    --shadow-card: 0 4px 24px rgba(0,0,0,0.4), 0 1px 4px rgba(0,0,0,0.3);
    --shadow-card-hover: 0 8px 32px rgba(0,0,0,0.5), 0 2px 8px rgba(0,0,0,0.4);

    --font-display: 'Syne', sans-serif;
    --font-body: 'DM Sans', sans-serif;

    --transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 62.5%;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1.6rem;
    min-height: 100dvh;
    overflow-x: hidden;
}

main {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    height: 100dvh;
    padding: 0;
    overflow: hidden;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 2rem 2.8rem 1.6rem;
    border-bottom: 1px solid var(--border-subtle);
    flex-shrink: 0;
    gap: 1.6rem;
    flex-wrap: wrap;
}

.header-left {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.breadcrumb {
    font-family: var(--font-body);
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.app-header h1 {
    font-family: var(--font-display);
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1;
}

.title-accent {
    color: var(--accent-todo);
    font-size: 1em;
    vertical-align: super;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

.board-stats {
    display: flex;
    gap: 0.8rem;
}

.stat {
    font-family: var(--font-body);
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--text-muted);
    background: var(--bg-column);
    border: 1px solid var(--border-subtle);
    padding: 0.4rem 1rem;
    border-radius: 100px;
}

.btn-add-hint {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--font-body);
    font-size: 1.6rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--accent-todo);
    border: none;
    padding: 0.7rem 1.4rem;
    border-radius: 100px;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0.9;
}

.btn-add-hint:hover {
    opacity: 1;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(108, 99, 255, 0.4);
}

/* ---- Hint Bar ---- */
.hint-bar {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.8rem 2.8rem;
    font-size: 1.2rem;
    color: var(--text-muted);
    background: rgba(108, 99, 255, 0.06);
    border-bottom: 1px solid rgba(108, 99, 255, 0.1);
    flex-shrink: 0;
    animation: slideDown 0.4s ease forwards;
}

.hint-bar strong {
    color: var(--accent-todo);
}

.hint-bar.hidden {
    display: none;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---- Columns Board ---- */
.main-columns {
    display: flex;
    gap: 1.6rem;
    padding: 2rem 2.8rem 2rem;
    overflow-x: auto;
    overflow-y: hidden;
    flex: 1;
    align-items: flex-start;
    scrollbar-width: thin;
    scrollbar-color: var(--text-muted) transparent;
}

.main-columns::-webkit-scrollbar {
    height: 6px;
}
.main-columns::-webkit-scrollbar-track {
    background: transparent;
}
.main-columns::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 100px;
}

/* ---- Column ---- */
.columns-column {
    flex: 0 0 300px;
    min-width: 0;
    background: var(--bg-column);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    max-height: calc(100dvh - 180px);
    transition: var(--transition);
    overflow: hidden;
}

.columns-column:hover {
    border-color: var(--border-card);
}

.column-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1.6rem 1.6rem 1.2rem;
    flex-shrink: 0;
}

.column-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.dot-todo { background: var(--accent-todo); box-shadow: 0 0 8px var(--accent-todo); }
.dot-progress { background: var(--accent-progress); box-shadow: 0 0 8px var(--accent-progress); }
.dot-review { background: var(--accent-review); box-shadow: 0 0 8px var(--accent-review); }
.dot-done { background: var(--accent-done); box-shadow: 0 0 8px var(--accent-done); }

.column__title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    flex: 1;
}

.column-count {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-muted);
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border-subtle);
    min-width: 2.2rem;
    height: 2.2rem;
    border-radius: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 0.6rem;
    transition: var(--transition);
}

/* ---- Cards dos Area ---- */
.column__cards {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0.4rem 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    scrollbar-width: thin;
    scrollbar-color: var(--text-muted) transparent;
    min-height: 60px;
}

.column__cards::-webkit-scrollbar {
    width: 4px;
}
.column__cards::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 100px;
}

/* ---- Drop Highlight ---- */
.column__cards.column--highlight {
    background: rgba(108, 99, 255, 0.05);
    border-radius: var(--radius-lg);
    outline: 2px dashed rgba(108, 99, 255, 0.4);
    outline-offset: -4px;
}

/* ---- Add Card Button ---- */
.btn-add-card {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin: 0.8rem 1.2rem 1.2rem;
    padding: 0.8rem 1.2rem;
    background: transparent;
    border: 1px dashed var(--border-card);
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-family: var(--font-body);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    width: calc(100% - 2.4rem);
    flex-shrink: 0;
}

.btn-add-card:hover {
    background: rgba(108, 99, 255, 0.08);
    border-color: var(--accent-todo);
    color: var(--accent-todo);
}

/* ---- Card ---- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 1.2rem 1.4rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    cursor: grab;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition), background var(--transition);
    position: relative;
    overflow: hidden;
    animation: cardIn 0.25s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    flex-shrink: 0;
}

@keyframes cardIn {
    from { opacity: 0; transform: translateY(8px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    transition: var(--transition);
}

.card.baixa::before { background: var(--priority-low); }
.card.media::before { background: var(--priority-medium); }
.card.alta::before { background: var(--priority-high); }
.card.card__taxado::before { background: var(--text-muted); }

.card:hover {
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.card:active {
    cursor: grabbing;
}

.card.dragging {
    opacity: 0.4;
    transform: rotate(2deg) scale(0.97);
}

/* ---- Card Inner Layout ---- */
.card__header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.card__check {
    width: 1.6rem;
    height: 1.6rem;
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 0.2rem;
    cursor: pointer;
    accent-color: var(--accent-todo);
}

.card__text {
    flex: 1;
    font-family: var(--font-body);
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.5;
    outline: none;
    min-height: 2.1rem;
    word-break: break-word;
}

.card__text:focus {
    color: var(--text-primary);
}

.card__text[contenteditable="true"]:empty::before {
    content: 'Escreva aqui…';
    color: var(--text-muted);
    font-style: italic;
    pointer-events: none;
}

.card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
}

.card__importancia {
    font-family: var(--font-body);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-muted);
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-subtle);
    border-radius: 100px;
    padding: 0.3rem 0.9rem;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    transition: var(--transition);
    outline: none;
}

.card__importancia:hover, .card__importancia:focus {
    background: rgba(255,255,255,0.1);
    border-color: var(--border-card);
}

.card.baixa .card__importancia { color: var(--priority-low); border-color: rgba(16, 185, 129, 0.3); }
.card.media .card__importancia { color: var(--priority-medium); border-color: rgba(245, 158, 11, 0.3); }
.card.alta .card__importancia { color: var(--priority-high); border-color: rgba(239, 68, 68, 0.3); }

.card__delete {
    width: 2.4rem;
    height: 2.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
    flex-shrink: 0;
}

.card:hover .card__delete {
    opacity: 1;
}

.card__delete:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--priority-high);
}

/* ---- Checked / Taxado ---- */
.card.card__taxado {
    opacity: 0.5;
}

.card.card__taxado .card__text {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* ---- Toast ---- */
.toast {
    position: fixed;
    bottom: 2.4rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-card);
    border: 1px solid var(--border-card);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1.3rem;
    padding: 0.9rem 1.8rem;
    border-radius: 100px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    white-space: nowrap;
    z-index: 999;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* Tablets & desktops */
@media (max-width: 900px) {
    .app-header {
        padding: 1.6rem 2rem 1.2rem;
    }
    .main-columns {
        padding: 1.6rem 2rem;
        gap: 1.2rem;
    }
    .columns-column {
        flex: 0 0 260px;
    }
}

/* Mobile */
@media (max-width: 600px) {
    .app-header {
        padding: 1.4rem 1.6rem 1rem;
        flex-wrap: nowrap;
    }
    .app-header h1 {
        font-size: 2.2rem;
    }
    .board-stats {
        display: none;
    }
    .btn-add-hint span {
        display: none;
    }
    .hint-bar {
        padding: 0.7rem 1.6rem;
        font-size: 1.15rem;
    }
    .main-columns {
        padding: 1.2rem 1.2rem 1.6rem;
        gap: 1rem;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
    }
    .columns-column {
        flex: 0 0 82vw;
        max-height: calc(100dvh - 160px);
        scroll-snap-align: start;
    }
    .card {
        padding: 1rem 1.2rem;
    }
}

@media (max-width: 360px) {
    .columns-column {
        flex: 0 0 88vw;
    }
}