/* ===== MONO DESIGN SYSTEM 2026 ===== */
:root {
    --black: #0a0a0a;
    --gray-950: #171717;
    --gray-900: #1a1a1a;
    --gray-800: #262626;
    --gray-700: #404040;
    --gray-600: #525252;
    --gray-500: #737373;
    --gray-400: #a3a3a3;
    --gray-300: #d4d4d4;
    --gray-200: #e5e5e5;
    --gray-150: #ededed;
    --gray-100: #f5f5f5;
    --gray-50: #fafafa;
    --white: #ffffff;

    --success: #22c55e;
    --success-soft: #f0fdf4;
    --success-border: #bbf7d0;
    --danger: #ef4444;
    --danger-soft: #fef2f2;
    --danger-border: #fecaca;

    --bg: var(--white);
    --bg-secondary: var(--gray-50);
    --bg-input: var(--white);
    --text: var(--black);
    --text-secondary: var(--gray-500);
    --text-dim: var(--gray-400);
    --border: var(--gray-200);
    --border-hover: var(--gray-300);
    --border-focus: var(--black);

    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.06), 0 0 0 1px rgba(0,0,0,0.04);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.08), 0 0 0 1px rgba(0,0,0,0.03);

    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ===== CONTAINER ===== */
.app-container {
    width: 100%;
    max-width: 420px;
    padding: 24px 20px 40px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ===== HEADER ===== */
.app-header {
    text-align: center;
    padding: 20px 0 32px;
}
.app-logo {
    width: 48px; height: 48px;
    background: var(--black);
    border-radius: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}
.app-logo svg { color: white; }
.app-header h1 {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    color: var(--black);
    margin-bottom: 4px;
}
.app-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
}
.spots-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 14px;
    padding: 5px 12px;
    background: var(--gray-100);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
}
.spots-pill svg { width: 13px; height: 13px; }

/* ===== TABS ===== */
.tab-bar {
    display: flex;
    background: var(--gray-100);
    border-radius: var(--radius-md);
    padding: 3px;
    margin-bottom: 20px;
}
.tab-btn {
    flex: 1;
    padding: 9px 0;
    border: none;
    border-radius: 11px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: inherit;
}
.tab-btn svg { width: 15px; height: 15px; }
.tab-btn.active {
    background: var(--white);
    color: var(--black);
    box-shadow: var(--shadow-sm);
}
.tab-btn:not(.active):hover { color: var(--text); }

/* ===== CARD ===== */
.card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-lg);
    animation: cardIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes cardIn {
    from { opacity: 0; transform: translateY(12px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ===== FORM ===== */
.form-group { margin-bottom: 18px; }
.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}
.form-input {
    width: 100%;
    padding: 12px 14px;
    background: var(--bg-input);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    outline: none;
}
.form-input::placeholder { color: var(--text-dim); }
.form-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(10,10,10,0.06);
}
.form-hint {
    font-size: 0.72rem;
    color: var(--text-dim);
    margin-top: 5px;
}

/* ===== BUTTONS ===== */
.btn {
    width: 100%;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    font-family: inherit;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary {
    background: var(--black);
    color: var(--white);
}
.btn-primary:hover {
    background: var(--gray-800);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1.5px solid var(--border);
}
.btn-ghost:hover {
    background: var(--gray-50);
    border-color: var(--border-hover);
    color: var(--text);
}
.btn-success {
    background: var(--success);
    color: white;
}
.btn-success:hover { opacity: 0.9; }
.btn-sm {
    padding: 8px 14px;
    font-size: 0.78rem;
    width: auto;
    border-radius: 8px;
}

/* ===== SCREENS ===== */
.screen { display: none; }
.screen.active { display: block; }

/* ===== LOADING ===== */
.loading-container {
    text-align: center;
    padding: 44px 0;
}
.loading-spinner {
    width: 40px; height: 40px;
    margin: 0 auto 24px;
    border: 2.5px solid var(--gray-200);
    border-top-color: var(--black);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
}
.loading-stage {
    font-size: 0.82rem;
    color: var(--text-secondary);
}
.loading-dots::after {
    content: '';
    animation: dots 1.5s steps(4) infinite;
}
@keyframes dots {
    0% { content: ''; }
    25% { content: '.'; }
    50% { content: '..'; }
    75% { content: '...'; }
}
.loading-progress {
    margin-top: 28px;
    height: 3px;
    background: var(--gray-150);
    border-radius: 2px;
    overflow: hidden;
}
.loading-progress-bar {
    height: 100%;
    background: var(--black);
    border-radius: 2px;
    width: 0%;
    animation: progressFill 8s ease-in-out forwards;
}
@keyframes progressFill {
    0% { width: 0%; }
    15% { width: 20%; }
    40% { width: 45%; }
    65% { width: 70%; }
    85% { width: 85%; }
    100% { width: 95%; }
}

/* ===== SUCCESS ===== */
.success-container { text-align: center; }
.success-icon-wrap {
    width: 72px; height: 72px;
    margin: 0 auto 20px;
    background: var(--success-soft);
    border: 2px solid var(--success-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: successPop 0.5s var(--transition-spring);
}
@keyframes successPop {
    from { transform: scale(0); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.success-icon-wrap svg { color: var(--success); width: 32px; height: 32px; }
.success-title {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 4px;
}
.success-subtitle {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 24px;
}

.detail-list {
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 18px;
    text-align: left;
}
.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 13px 16px;
    border-bottom: 1px solid var(--border);
}
.detail-row:last-child { border-bottom: none; }
.detail-label { font-size: 0.78rem; color: var(--text-secondary); }
.detail-value { font-size: 0.82rem; font-weight: 600; text-align: right; }

.info-banner {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 13px 14px;
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 18px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    text-align: left;
    line-height: 1.55;
}
.info-banner svg { width: 16px; height: 16px; color: var(--text-dim); flex-shrink: 0; margin-top: 1px; }

/* ===== ERROR ===== */
.error-container { text-align: center; }
.error-icon-wrap {
    width: 72px; height: 72px;
    margin: 0 auto 20px;
    background: var(--danger-soft);
    border: 2px solid var(--danger-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: shake 0.45s ease;
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-3px); }
    80% { transform: translateX(3px); }
}
.error-icon-wrap svg { color: var(--danger); width: 32px; height: 32px; }
.error-title {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}
.error-message {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 24px;
    line-height: 1.6;
}
.btn-row { display: flex; gap: 10px; }
.btn-row .btn { flex: 1; }

/* ===== WARRANTY ===== */
.warranty-status-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px;
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}
.warranty-status-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 3px;
}
.warranty-status-value { font-weight: 700; font-size: 0.9rem; }

.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 9px;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 600;
}
.badge-success { background: var(--success-soft); color: #16a34a; border: 1px solid var(--success-border); }
.badge-danger { background: var(--danger-soft); color: var(--danger); border: 1px solid var(--danger-border); }
.badge-muted { background: var(--gray-100); color: var(--text-dim); border: 1px solid var(--border); }
.badge-dark { background: var(--gray-950); color: var(--white); border: 1px solid var(--gray-800); }

.record-card {
    padding: 16px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 10px;
    transition: var(--transition);
}
.record-card:hover { border-color: var(--border-hover); box-shadow: var(--shadow-sm); }
.record-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}
.record-code {
    font-family: 'SF Mono', 'Fira Code', ui-monospace, monospace;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.record-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}
.record-field-label {
    font-size: 0.68rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 2px;
}
.record-field-value { font-size: 0.82rem; font-weight: 500; }
.record-field-full { grid-column: span 2; }

.reuse-banner {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px;
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-top: 16px;
}
.reuse-banner-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--black);
}
.reuse-banner-header svg { width: 16px; height: 16px; }
.reuse-banner p {
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.5;
}
.reuse-code-row { display: flex; gap: 8px; }
.reuse-code-input {
    flex: 1;
    padding: 9px 12px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-family: 'SF Mono', ui-monospace, monospace;
    font-size: 0.9rem;
}

.section-title {
    font-size: 0.82rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 6px;
}
.section-title svg { width: 14px; height: 14px; color: var(--text-dim); }

/* ===== TOAST ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
}
.toast {
    padding: 10px 18px;
    background: var(--gray-950);
    color: var(--white);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 7px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    animation: toastIn 0.35s var(--transition-spring);
    white-space: nowrap;
}
.toast svg { width: 15px; height: 15px; }
.toast-success svg { color: var(--success); }
@keyframes toastIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== DIVIDER ===== */
.divider {
    height: 1px;
    background: var(--border);
    margin: 20px 0;
}

/* ===== MOBILE ===== */
@media (max-width: 480px) {
    .app-container { padding: 16px 16px 32px; }
    .app-header { padding: 14px 0 24px; }
    .app-header h1 { font-size: 1.4rem; }
    .card { padding: 22px 18px; border-radius: 16px; }
    .btn-row { flex-direction: column; }
    .record-grid { grid-template-columns: 1fr; }
    .record-field-full { grid-column: span 1; }
}