/* ============================================================
   setogiwa — Design System
   Dark, minimal, hyper-focused aesthetic
   ============================================================ */

:root {
    --bg: #0a0a0f;
    --bg-card: #14141f;
    --bg-input: #1a1a28;
    --bg-hover: #1e1e30;

    --accent: #6c5ce7;
    --accent-glow: rgba(108, 92, 231, 0.3);
    --accent-soft: rgba(108, 92, 231, 0.12);

    --green: #00d2a0;
    --green-glow: rgba(0, 210, 160, 0.3);

    --text: #e8e8f0;
    --text-secondary: #8888a8;
    --text-muted: #55556a;

    --border: rgba(255, 255, 255, 0.06);
    --border-focus: rgba(108, 92, 231, 0.5);

    --font: 'Inter', 'Noto Sans JP', -apple-system, sans-serif;

    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html,
body {
    height: 100%;
    overflow: hidden;
    touch-action: manipulation;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    display: flex;
    align-items: center;
    justify-content: center;
    -webkit-font-smoothing: antialiased;
}

/* --- Particle Canvas --- */
#particles {
    position: fixed;
    inset: 0;
    z-index: 100;
    pointer-events: none;
}

/* --- App Container --- */
#app {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    justify-content: center;
}

/* --- Header --- */
.app-header {
    text-align: center;
    margin-bottom: 3rem;
}

.logo {
    font-size: 2.4rem;
    font-weight: 900;
    letter-spacing: -0.02em;
    color: var(--text);
    line-height: 1;
}

.logo-sub {
    display: block;
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--accent);
    margin-top: 0.4rem;
}

.tagline {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.6rem;
    letter-spacing: 0.02em;
}

/* --- Mode switching --- */
.mode {
    display: none;
    animation: fadeSlideIn 0.35s var(--ease) both;
}

.mode.active {
    display: block;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   FOCUS MODE
   ============================================================ */

/* Empty state */
.empty-state {
    text-align: center;
    padding: 3rem 0;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.6;
}

.empty-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.empty-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Task display */
.task-display {
    text-align: center;
    padding: 2rem 0;
}

.task-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.task-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.3s var(--ease);
    box-shadow: 0 4px 40px rgba(0, 0, 0, 0.3);
}

.task-card::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 17px;
    padding: 1px;
    background: linear-gradient(135deg, var(--accent-soft), transparent 60%);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

.task-text {
    font-size: clamp(1.4rem, 4vw, 2rem);
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: -0.01em;
    color: var(--text);
    word-break: break-word;
}

.task-progress {
    margin-top: 1.5rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* Mobile action buttons */
.mobile-actions {
    display: none;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin-top: 2rem;
}

.mobile-btn {
    font-family: var(--font);
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    -webkit-tap-highlight-color: transparent;
}

.mobile-btn-done {
    font-size: 1rem;
    padding: 0.9rem 2.5rem;
    background: var(--green);
    color: #0a0a0f;
    border-radius: 50px;
    box-shadow: 0 4px 20px var(--green-glow);
}

.mobile-btn-done:active {
    transform: scale(0.95);
    box-shadow: 0 2px 10px var(--green-glow);
}

.mobile-btn-skip {
    font-size: 1.1rem;
    padding: 0.7rem 1.2rem;
    background: var(--bg-input);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 50px;
}

.mobile-btn-skip:active {
    background: var(--bg-hover);
    transform: scale(0.95);
}

.mobile-btn-add {
    display: none;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    background: var(--accent-soft);
    border: 1px solid rgba(108, 92, 231, 0.2);
    border-radius: 10px;
    padding: 0.65rem 1.5rem;
    margin-top: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.mobile-btn-add:active {
    background: rgba(108, 92, 231, 0.2);
    transform: scale(0.97);
}

.mobile-btn-submit {
    display: none;
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 600;
    color: #0a0a0f;
    background: var(--accent);
    border: none;
    border-radius: 10px;
    padding: 0.8rem 1.5rem;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.mobile-btn-submit:active {
    transform: scale(0.95);
}

.mobile-btn-back {
    display: none;
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-muted);
    background: none;
    border: none;
    padding: 0.75rem 0;
    cursor: pointer;
    margin-top: 0.5rem;
    -webkit-tap-highlight-color: transparent;
}

.mobile-btn-back:active {
    color: var(--text-secondary);
}

/* Task transition animations */
.task-card.slide-out-left {
    animation: slideOutLeft 0.25s var(--ease) forwards;
}

.task-card.slide-out-right {
    animation: slideOutRight 0.25s var(--ease) forwards;
}

.task-card.slide-in {
    animation: slideIn 0.3s var(--ease) both;
}

@keyframes slideOutLeft {
    to {
        opacity: 0;
        transform: translateX(-60px) scale(0.95);
    }
}

@keyframes slideOutRight {
    to {
        opacity: 0;
        transform: translateX(60px) scale(0.95);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(40px) scale(0.95);
    }

    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

/* Completion overlay */
.complete-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 210, 160, 0.08);
    z-index: 50;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.complete-overlay.show {
    opacity: 1;
    animation: completePulse 0.6s ease both;
}

.complete-text {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--green);
    text-shadow: 0 0 40px var(--green-glow);
    animation: completeTextBounce 0.5s var(--ease) both;
}

@keyframes completePulse {
    0% {
        background: rgba(0, 210, 160, 0);
    }

    30% {
        background: rgba(0, 210, 160, 0.12);
    }

    100% {
        background: rgba(0, 210, 160, 0);
    }
}

@keyframes completeTextBounce {
    0% {
        opacity: 0;
        transform: scale(0.5);
    }

    50% {
        transform: scale(1.15);
    }

    100% {
        opacity: 1;
        transform: scale(1);
    }
}

/* Delete progress bar */
.task-card .delete-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: #ff6b6b;
    border-radius: 0 0 16px 16px;
    width: 0;
    transition: width 0.05s linear;
}

/* ============================================================
   ADD MODE
   ============================================================ */
.add-container {
    margin-bottom: 2rem;
}

.add-label {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.input-row {
    position: relative;
}

.task-input {
    width: 100%;
    font-family: var(--font);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.task-input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.task-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

/* Flash effect when adding */
.task-input.flash {
    animation: inputFlash 0.35s ease;
}

@keyframes inputFlash {
    0% {
        box-shadow: 0 0 0 3px var(--accent-soft);
    }

    50% {
        box-shadow: 0 0 0 6px var(--green-glow);
        border-color: var(--green);
    }

    100% {
        box-shadow: 0 0 0 3px var(--accent-soft);
    }
}

/* Backlog */
.backlog {
    margin-top: 1rem;
}

.backlog-title {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.backlog-count {
    font-size: 0.65rem;
    font-weight: 700;
    background: var(--accent-soft);
    color: var(--accent);
    padding: 0.15rem 0.5rem;
    border-radius: 10px;
}

.backlog-list {
    list-style: none;
    max-height: 280px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.backlog-list li {
    font-size: 0.88rem;
    font-weight: 400;
    color: var(--text-secondary);
    padding: 0.6rem 0.75rem;
    border-radius: 8px;
    border-bottom: 1px solid var(--border);
    transition: background 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.backlog-list li::before {
    content: '·';
    font-size: 1.5rem;
    color: var(--text-muted);
    line-height: 1;
}

.backlog-list li:last-child {
    border-bottom: none;
}

.backlog-empty {
    font-size: 0.82rem;
    color: var(--text-muted);
    text-align: center;
    padding: 1.5rem;
    font-style: italic;
}

/* ============================================================
   KEY HINTS (footer)
   ============================================================ */
.key-hints {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.75rem 1.5rem;
    text-align: center;
    background: linear-gradient(to top, var(--bg), transparent);
}

.hints {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    flex-wrap: wrap;
}

.hints span {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
}

kbd {
    display: inline-block;
    font-family: var(--font);
    font-size: 0.62rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.15rem 0.4rem;
    margin-right: 0.2rem;
    line-height: 1.3;
}

/* ============================================================
   All-done state
   ============================================================ */
.all-done {
    text-align: center;
    padding: 3rem 0;
}

.all-done-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.all-done-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--green);
    margin-bottom: 0.5rem;
}

.all-done-sub {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 480px) {
    #app {
        padding: 1.5rem 1rem;
    }

    .logo {
        font-size: 2rem;
    }

    .task-text {
        font-size: 1.3rem;
    }

    .task-card {
        padding: 2rem 1.5rem;
    }

    .hints {
        gap: 0.6rem;
    }

    .hints span {
        font-size: 0.62rem;
    }
}

/* Touch device: show mobile buttons, hide keyboard hints */
@media (hover: none) and (pointer: coarse) {
    .key-hints {
        display: none;
    }

    .mobile-actions {
        display: flex;
    }

    .mobile-btn-add {
        display: inline-block;
    }

    .mobile-btn-submit {
        display: block;
    }

    .mobile-btn-back {
        display: block;
    }

    .input-row {
        display: flex;
        gap: 0.5rem;
    }

    .task-input {
        flex: 1;
    }

    .empty-hint kbd {
        display: none;
    }

    .empty-hint {
        display: none;
    }

    .app-header {
        margin-bottom: 2rem;
    }

    #app {
        padding: 1.5rem 1rem;
    }

    .task-card {
        padding: 2rem 1.5rem;
    }

    body {
        overflow-y: auto;
    }
}