/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --card-bg: rgba(255, 255, 255, 0.035);
    --card-border: rgba(255, 255, 255, 0.07);
    --accent: #fbbf24;
    --accent-hover: #f59e0b;
    --accent-glow: rgba(251, 191, 36, 0.25);
    --accent-green: #34d399;
    --accent-red: #f87171;
    --accent-purple: #8b5cf6;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --input-bg: rgba(255, 255, 255, 0.055);
    --input-border: rgba(255, 255, 255, 0.1);
    --input-focus: rgba(251, 191, 36, 0.35);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --font: 'Inter', 'Noto Sans JP', -apple-system, sans-serif;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ===== Background Glow ===== */
.bg-glow {
    position: fixed; border-radius: 50%; filter: blur(120px);
    pointer-events: none; z-index: 0; opacity: 0.4;
}
.bg-glow-1 {
    width: 400px; height: 400px; top: -100px; right: -100px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.3), transparent);
}
.bg-glow-2 {
    width: 350px; height: 350px; bottom: 20%; left: -80px;
    background: radial-gradient(circle, rgba(251, 191, 36, 0.15), transparent);
}

/* ===== Container ===== */
.container {
    position: relative; z-index: 1;
    max-width: 560px; margin: 0 auto;
    padding: 1.5rem 1rem 3rem;
}

/* ===== Header ===== */
.header {
    text-align: center; margin-bottom: 2rem;
    animation: fadeInDown 0.6s ease;
}
.logo { font-size: 2.5rem; margin-bottom: 0.5rem; }
.header h1 {
    font-size: 1.6rem; font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.subtitle { color: var(--text-secondary); font-size: 0.875rem; margin-top: 0.25rem; }

/* ===== Form Sections ===== */
.form-section {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    animation: fadeInUp 0.5s ease both;
}
.form-section[data-section="2"] { animation-delay: 0.1s; }
.form-section[data-section="3"] { animation-delay: 0.2s; }
.form-section[data-section="4"] { animation-delay: 0.3s; }

.section-header {
    display: flex; align-items: center; gap: 0.75rem;
    margin-bottom: 1.25rem;
}
.section-number {
    width: 28px; height: 28px; border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: #0a0a1a; font-weight: 700; font-size: 0.8rem;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.section-header h2 { font-size: 1.1rem; font-weight: 600; }

/* ===== Form Groups ===== */
.form-group { margin-bottom: 1.25rem; }
.form-group:last-child { margin-bottom: 0; }
.form-group label {
    display: flex; align-items: center; gap: 0.4rem;
    font-size: 0.875rem; font-weight: 500;
    color: var(--text-secondary); margin-bottom: 0.5rem;
}
.label-icon { font-size: 1rem; }

/* ===== Inputs ===== */
.input-wrapper { position: relative; }
input[type="text"], input[type="date"], textarea, select {
    width: 100%; padding: 0.75rem 1rem;
    background: var(--input-bg); border: 1px solid var(--input-border);
    border-radius: var(--radius-md); color: var(--text-primary);
    font-family: var(--font); font-size: 0.9375rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}
input:focus, textarea:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--input-focus);
}
input::placeholder, textarea::placeholder {
    color: var(--text-muted); opacity: 0.7;
}
textarea { resize: vertical; min-height: 80px; }
.custom-input-wrapper {
    margin-top: 0.5rem;
    animation: fadeInUp 0.3s ease;
}

/* ===== Error Messages ===== */
.error-msg {
    font-size: 0.8rem; color: var(--accent-red);
    margin-top: 0.35rem; min-height: 0;
    transition: all var(--transition);
}
.error-msg:empty { display: none; }
input.has-error, textarea.has-error {
    border-color: var(--accent-red);
    box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.2);
}

/* ===== Pill Options (Rank) ===== */
.pill-options {
    display: flex; flex-wrap: wrap; gap: 0.5rem;
}
.pill-btn {
    padding: 0.55rem 1.1rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-secondary);
    font-family: var(--font); font-size: 0.85rem; font-weight: 500;
    cursor: pointer; transition: all var(--transition);
    user-select: none; -webkit-tap-highlight-color: transparent;
}
.pill-btn:hover { border-color: var(--accent); color: var(--text-primary); }
.pill-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border-color: transparent; color: #0a0a1a; font-weight: 600;
    box-shadow: 0 4px 15px var(--accent-glow);
    transform: scale(1.03);
}

/* ===== Circle Options (MT Count) ===== */
.circle-options { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.circle-btn {
    width: 48px; height: 48px; border-radius: 50%;
    border: 1.5px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-secondary);
    font-family: var(--font); font-size: 1rem; font-weight: 600;
    cursor: pointer; transition: all var(--transition);
    display: flex; align-items: center; justify-content: center;
    user-select: none; -webkit-tap-highlight-color: transparent;
}
.circle-btn:hover { border-color: var(--accent); color: var(--text-primary); }
.circle-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border-color: transparent; color: #0a0a1a;
    box-shadow: 0 4px 15px var(--accent-glow);
    transform: scale(1.1);
}

/* ===== Month Navigator ===== */
.month-navigator {
    display: flex; align-items: center; justify-content: center;
    gap: 1rem; margin-bottom: 1rem;
}
.month-label {
    font-size: 1.05rem; font-weight: 600;
    color: var(--text-primary); min-width: 120px; text-align: center;
}
.month-nav-btn {
    width: 36px; height: 36px; border-radius: 50%;
    border: 1px solid var(--input-border); background: var(--input-bg);
    color: var(--text-secondary); font-size: 1.3rem;
    cursor: pointer; transition: all var(--transition);
    display: flex; align-items: center; justify-content: center;
}
.month-nav-btn:hover {
    border-color: var(--accent); color: var(--accent);
}

/* ===== Schedule Picker ===== */
.schedule-picker { display: flex; flex-direction: column; gap: 0.4rem; }

/* Day Card */
.day-card {
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.02);
    overflow: hidden; transition: all var(--transition);
}
.day-card:hover { border-color: rgba(255, 255, 255, 0.12); }
.day-card.has-selection { border-color: rgba(251, 191, 36, 0.25); }
.day-card.weekend-sat .day-name { color: #60a5fa; }
.day-card.weekend-sun .day-name { color: #fb7185; }

.day-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.7rem 1rem; cursor: pointer;
    transition: background var(--transition);
    -webkit-tap-highlight-color: transparent;
}
.day-header:hover { background: rgba(255, 255, 255, 0.03); }
.day-header:active { background: rgba(255, 255, 255, 0.05); }
.day-info { display: flex; align-items: center; gap: 0.5rem; }
.day-number { font-weight: 600; font-size: 0.95rem; }
.day-name { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; }
.day-meta { display: flex; align-items: center; gap: 0.5rem; }
.selection-badge {
    background: var(--accent); color: #0a0a1a;
    font-size: 0.7rem; font-weight: 700;
    width: 20px; height: 20px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
}
.expand-icon {
    color: var(--text-muted); font-size: 0.8rem;
    transition: transform var(--transition);
}
.day-card.expanded .expand-icon { transform: rotate(180deg); }

/* Day Slots */
.day-slots {
    max-height: 0; overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                padding 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0 0.75rem;
}
.day-card.expanded .day-slots {
    max-height: 380px; padding: 0 0.75rem 0.75rem;
}

/* Range Selector */
.range-selector {
    display: flex; align-items: center; gap: 0.35rem;
    padding-bottom: 0.6rem; margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--card-border);
}
.range-start, .range-end {
    flex: 1; padding: 0.4rem 0.3rem;
    background: var(--input-bg); border: 1px solid var(--input-border);
    border-radius: var(--radius-sm); color: var(--text-primary);
    font-family: var(--font); font-size: 0.8rem;
    outline: none; cursor: pointer;
    appearance: none; -webkit-appearance: none;
    text-align: center;
}
.range-start:focus, .range-end:focus {
    border-color: var(--accent);
}
.range-sep {
    color: var(--text-muted); font-size: 0.8rem; flex-shrink: 0;
}
.range-btn {
    padding: 0.4rem 0.65rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border: none; border-radius: var(--radius-sm);
    color: #0a0a1a; font-family: var(--font);
    font-size: 0.75rem; font-weight: 600;
    cursor: pointer; white-space: nowrap;
    transition: all var(--transition);
}
.range-btn:hover { transform: scale(1.05); }
.range-btn:active { transform: scale(0.95); }
.range-clear-btn {
    padding: 0.4rem 0.55rem;
    background: transparent;
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    color: var(--text-muted); font-family: var(--font);
    font-size: 0.75rem; cursor: pointer;
    white-space: nowrap; transition: all var(--transition);
}
.range-clear-btn:hover {
    border-color: var(--accent-red); color: var(--accent-red);
}

.slots-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4rem;
}

/* Time Slot Buttons */
.time-slot {
    padding: 0.5rem 0.2rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--input-border);
    background: var(--input-bg);
    color: var(--text-secondary);
    font-family: var(--font); font-size: 0.8rem; font-weight: 500;
    cursor: pointer; transition: all var(--transition);
    text-align: center;
    -webkit-tap-highlight-color: transparent;
    min-height: 40px;
    display: flex; align-items: center; justify-content: center;
}
.time-slot:hover { border-color: var(--accent); color: var(--text-primary); }
.time-slot:active { transform: scale(0.95); }
.time-slot.selected {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border-color: transparent; color: #0a0a1a; font-weight: 600;
    box-shadow: 0 2px 10px var(--accent-glow);
}
.time-slot.free-slot {
    grid-column: 1 / -1;
    background: rgba(52, 211, 153, 0.08);
    border-color: rgba(52, 211, 153, 0.2);
    color: var(--accent-green);
    font-weight: 600;
}
.time-slot.free-slot.selected {
    background: linear-gradient(135deg, #34d399, #10b981);
    color: #0a0a1a;
    box-shadow: 0 2px 10px rgba(52, 211, 153, 0.3);
}

/* ===== Selection Summary ===== */
.selection-summary {
    margin-top: 1rem; padding: 1rem;
    background: rgba(251, 191, 36, 0.05);
    border: 1px solid rgba(251, 191, 36, 0.15);
    border-radius: var(--radius-md);
    animation: fadeInUp 0.3s ease;
}
.selection-summary h3 {
    font-size: 0.9rem; margin-bottom: 0.6rem; color: var(--accent);
}
.summary-item {
    font-size: 0.825rem; color: var(--text-secondary);
    padding: 0.2rem 0;
}
.summary-item strong { color: var(--text-primary); }

/* ===== Submit Button ===== */
.submit-btn {
    width: 100%; padding: 1rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    border: none; border-radius: var(--radius-md);
    color: #0a0a1a; font-family: var(--font);
    font-size: 1.05rem; font-weight: 700;
    cursor: pointer; transition: all var(--transition);
    display: flex; align-items: center; justify-content: center; gap: 0.5rem;
    margin-top: 1.5rem;
    box-shadow: 0 4px 20px var(--accent-glow);
}
.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(251, 191, 36, 0.35);
}
.submit-btn:active { transform: translateY(0); }
.btn-icon { font-size: 1.2rem; transition: transform var(--transition); }
.submit-btn:hover .btn-icon { transform: translateX(4px); }

/* ===== Overlays ===== */
.overlay {
    position: fixed; inset: 0; z-index: 100;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: none; align-items: center; justify-content: center;
}
.overlay.visible { display: flex; animation: fadeIn 0.3s ease; }
.overlay-content {
    background: var(--bg-secondary);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem; text-align: center;
    max-width: 340px; width: 90%;
    animation: scaleIn 0.3s ease;
}
.spinner {
    width: 40px; height: 40px; margin: 0 auto 1rem;
    border: 3px solid var(--card-border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
.success-checkmark {
    width: 60px; height: 60px; margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--accent-green), #10b981);
    border-radius: 50%; font-size: 1.8rem; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    animation: bounceIn 0.5s ease;
    color: #fff;
}
.error-icon {
    width: 60px; height: 60px; margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--accent-red), #ef4444);
    border-radius: 50%; font-size: 1.8rem; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
}
.overlay-content h2 { font-size: 1.2rem; margin-bottom: 0.3rem; }
.overlay-content p { color: var(--text-secondary); font-size: 0.9rem; }
.close-btn {
    margin-top: 1.25rem; padding: 0.6rem 2rem;
    background: var(--input-bg); border: 1px solid var(--input-border);
    border-radius: var(--radius-md); color: var(--text-primary);
    font-family: var(--font); font-size: 0.9rem;
    cursor: pointer; transition: all var(--transition);
}
.close-btn:hover { border-color: var(--accent); }

/* ===== Animations ===== */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-16px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}
@keyframes bounceIn {
    0% { transform: scale(0); }
    60% { transform: scale(1.15); }
    100% { transform: scale(1); }
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Responsive ===== */
@media (max-width: 480px) {
    .container { padding: 1rem 0.75rem 2rem; }
    .form-section { padding: 1.25rem; }
    .header h1 { font-size: 1.4rem; }
    .slots-grid { grid-template-columns: repeat(3, 1fr); }
    .day-card.expanded .day-slots { max-height: 420px; }
    .range-selector { flex-wrap: wrap; }
    .range-start, .range-end { min-width: 60px; }
    .circle-btn { width: 44px; height: 44px; font-size: 0.95rem; }
}

@media (min-width: 768px) {
    .container { padding: 2.5rem 1.5rem 4rem; }
    .slots-grid { grid-template-columns: repeat(5, 1fr); }
}