/* ============================================
   SnapShot App — Premium Checkout UI
   Dark theme with glass-morphism & gradients
   ============================================ */

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

:root {
    --bg-primary: #050505;
    --bg-card: rgba(10, 10, 10, 0.85);
    --bg-card-solid: #0a0a0a;
    --bg-elevated: #111111;
    --bg-hover: #1a1a1a;
    --border: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --border-accent: rgba(59, 130, 246, 0.25);
    --text-primary: #f5f5f5;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.12);
    --error: #ef4444;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.08);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(59, 130, 246, 0.06) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 80% 20%, rgba(99, 102, 241, 0.04) 0%, transparent 50%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s;
}
a:hover {
    color: var(--accent-hover);
}

/* ── Layout ── */

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 32px;
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    background: rgba(5, 5, 5, 0.8);
    position: sticky;
    top: 0;
    z-index: 50;
}

.app-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 18px;
    text-decoration: none;
    letter-spacing: -0.3px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border);
}

.user-name {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.app-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
}

.app-footer {
    padding: 20px 32px;
    text-align: center;
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--text-tertiary);
    letter-spacing: 0.2px;
}
.app-footer a {
    color: var(--text-tertiary);
}
.app-footer a:hover {
    color: var(--text-secondary);
}

/* ── Cards ── */

.app-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 48px;
    max-width: 680px;
    width: 100%;
    text-align: center;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: cardFadeIn 0.4s ease;
}

@keyframes cardFadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.app-card h1 {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.app-subtitle {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 36px;
    line-height: 1.5;
}

.app-note {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-top: 20px;
}

.step-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(99, 102, 241, 0.08));
    border: 1px solid var(--border-accent);
    border-radius: 20px;
    padding: 5px 16px;
    font-size: 11px;
    font-weight: 600;
    color: var(--accent-hover);
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

/* ── Buttons ── */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}
.btn-primary:hover {
    background: linear-gradient(135deg, #60a5fa, #3b82f6);
    color: white;
    box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
    transform: translateY(-1px);
}
.btn-primary:active {
    transform: translateY(0);
}
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}
.btn-secondary:active {
    transform: translateY(0);
}

.btn-lg {
    padding: 15px 32px;
    font-size: 16px;
    width: 100%;
    letter-spacing: -0.2px;
}

.btn-google {
    background: #ffffff;
    color: #1f1f1f;
    font-size: 15px;
    font-weight: 600;
    padding: 14px 32px;
    width: 100%;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}
.btn-google:hover {
    background: #f0f0f0;
    color: #1f1f1f;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}
.btn-google:active {
    transform: translateY(0);
}

.app-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 28px;
}

/* ── Interval Toggle ── */

.interval-toggle {
    display: inline-flex;
    justify-content: center;
    margin: 0 auto 32px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 28px;
    padding: 4px;
    gap: 2px;
}

.interval-toggle > .toggle-btn {
    padding: 9px 22px;
    border: none;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    background: transparent;
    color: var(--text-tertiary);
    font-family: inherit;
    border-radius: 24px;
    letter-spacing: 0.1px;
}

.interval-toggle > .toggle-btn:first-child {
    border-radius: 24px;
}
.interval-toggle > .toggle-btn:last-child {
    border-radius: 24px;
}

.interval-toggle > .toggle-btn:hover:not(.active) {
    color: var(--text-secondary);
    background: rgba(255,255,255,0.04);
}

.interval-toggle > .toggle-btn.active {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.save-badge {
    font-size: 10px;
    background: var(--success-glow);
    color: var(--success);
    padding: 2px 7px;
    border-radius: 6px;
    font-weight: 700;
    margin-left: 5px;
    letter-spacing: 0.3px;
}

.toggle-btn.active .save-badge {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* ── Plan Cards ── */

.plan-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 28px;
}

.plan-card {
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 22px;
    text-align: left;
    cursor: pointer;
    transition: all 0.25s ease;
    position: relative;
}
.plan-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.plan-card.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent), 0 4px 20px rgba(59, 130, 246, 0.15);
    background: linear-gradient(180deg, rgba(59, 130, 246, 0.04) 0%, var(--bg-elevated) 100%);
}

.plan-popular {
    position: absolute;
    top: -11px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #3b82f6, #6366f1);
    color: white;
    font-size: 10px;
    font-weight: 700;
    padding: 3px 14px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
    white-space: nowrap;
}

.plan-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    margin-top: 6px;
    letter-spacing: -0.2px;
}

.plan-price {
    margin-bottom: 4px;
    display: flex;
    align-items: baseline;
    gap: 2px;
}

.plan-amount {
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #fff, #d4d4d8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.plan-period {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: 500;
}

.plan-billing {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 18px;
}

.plan-features {
    list-style: none;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    line-height: 1.4;
}

.plan-select-btn {
    width: 100%;
    font-size: 14px;
    padding: 11px 16px;
}

/* ── Checkout Action ── */

.checkout-action {
    margin-top: 12px;
    animation: cardFadeIn 0.3s ease;
}

.checkout-summary {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.06), rgba(99, 102, 241, 0.04));
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    margin-bottom: 16px;
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.checkout-secure {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 14px;
    letter-spacing: 0.1px;
}

/* ── Loading ── */

.checkout-loading, .step-loading {
    padding: 40px;
    text-align: center;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid rgba(59, 130, 246, 0.15);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
    margin: 0 auto 18px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── Error ── */

.checkout-error {
    background: rgba(239, 68, 68, 0.06);
    border: 1px solid rgba(239, 68, 68, 0.15);
    border-radius: var(--radius-sm);
    padding: 18px;
    margin-top: 16px;
    text-align: center;
    animation: cardFadeIn 0.3s ease;
}
.checkout-error p {
    color: var(--error);
    font-size: 14px;
    margin-bottom: 12px;
    font-weight: 500;
}

/* ── Success ── */

.success-card {
    max-width: 580px;
}

.success-icon {
    font-size: 48px;
    margin-bottom: 8px;
}

.success-icon-large {
    font-size: 64px;
    margin-bottom: 20px;
}

.success-details {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin: 28px 0;
}

.success-detail-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
}
.success-detail-row + .success-detail-row {
    border-top: 1px solid var(--border);
}

.detail-label {
    color: var(--text-tertiary);
    font-size: 14px;
}
.detail-value {
    font-size: 14px;
    font-weight: 600;
}
.detail-active {
    color: var(--success);
    background: var(--success-glow);
    padding: 2px 10px;
    border-radius: var(--radius-xs);
}

.success-next-steps {
    text-align: left;
    margin-bottom: 28px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
}
.success-next-steps h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}
.success-next-steps ol {
    padding-left: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 8px;
    line-height: 1.5;
}

/* ── Trusted by / Social proof ── */

.trusted-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.trusted-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.trusted-item svg {
    opacity: 0.5;
}

/* ── Responsive ── */

@media (max-width: 640px) {
    .app-card {
        padding: 32px 20px;
        border-radius: 12px;
    }
    .plan-grid {
        grid-template-columns: 1fr;
    }
    .app-card h1 {
        font-size: 22px;
    }
    .app-header {
        padding: 14px 16px;
    }
    .plan-amount {
        font-size: 30px;
    }
    .interval-toggle {
        margin-bottom: 24px;
    }
    .trusted-row {
        flex-direction: column;
        gap: 10px;
    }
}