/**
 * Fitted Credits Store - Stylesheet
 * Version: 2.0 (Refactored Nov 30, 2025)
 *
 * Table of Contents:
 * 1. CSS Variables & Reset
 * 2. Base & Typography
 * 3. Layout Components
 * 4. Login Form
 * 5. Header & Navigation
 * 6. Balance Card
 * 7. Subscription Section
 * 8. Plan Cards (Subscription)
 * 9. Credit Pack Cards
 * 10. Features Grid
 * 11. Footer
 * 12. Utilities & States
 * 13. Responsive Breakpoints
 */

/* ===========================================
   1. CSS VARIABLES & RESET
   =========================================== */

:root {
    /* Colors - Background */
    --bg-page: #ffffff;
    --bg-card: #ffffff;
    --bg-subtle: #f9fafb;
    --bg-hover: #f3f4f6;

    /* Colors - Border */
    --border: #e5e7eb;
    --border-hover: #d1d5db;
    --border-strong: #9ca3af;

    /* Colors - Text */
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --text-on-primary: #ffffff;

    /* Colors - Primary (Dark slate) */
    --primary: #0f172a;
    --primary-hover: #1e293b;
    --primary-light: rgba(15, 23, 42, 0.1);

    /* Colors - Accent (Blue) */
    --accent: #3b82f6;
    --accent-hover: #1d4ed8;
    --accent-light: #dbeafe;

    /* Colors - Status */
    --success: #16a34a;
    --success-light: #dcfce7;
    --error: #dc2626;
    --error-light: #fef2f2;
    --error-border: #fee2e2;
    --warning: #c2410c;
    --warning-light: #ffedd5;

    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-accent: 0 4px 12px rgba(59, 130, 246, 0.3);
    --shadow-primary: 0 4px 12px rgba(15, 23, 42, 0.15);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 999px;

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing (4px base) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}


/* ===========================================
   2. BASE & TYPOGRAPHY
   =========================================== */

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--bg-page);
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

button {
    font-family: inherit;
    cursor: pointer;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary);
}


/* ===========================================
   3. LAYOUT COMPONENTS
   =========================================== */

.page-shell {
    max-width: 600px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

.app-container {
    flex: 1;
    padding: 0 var(--space-5) var(--space-10);
}

.section {
    margin-bottom: var(--space-8);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-5);
}

.section-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.section-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}


/* ===========================================
   4. LOGIN FORM
   =========================================== */

.login-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
}

.login-card {
    width: 100%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.login-header h2 {
    font-size: 1.5rem;
    margin-bottom: var(--space-2);
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--space-2);
}

.input-wrapper {
    position: relative;
}

.input-wrapper i {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 1.125rem;
    pointer-events: none;
}

.input-wrapper input {
    width: 100%;
    padding: 10px var(--space-3) 10px 38px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    background: var(--bg-card);
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.input-wrapper input::placeholder {
    color: var(--text-muted);
}

.login-features {
    margin-top: var(--space-8);
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.login-features .feature-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.error-message {
    background: var(--error-light);
    border: 1px solid var(--error-border);
    color: #991b1b;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-bottom: var(--space-4);
    display: none;
}

.error-message.show {
    display: block;
}


/* ===========================================
   5. HEADER & NAVIGATION
   =========================================== */

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-5) 0;
    margin-bottom: var(--space-6);
}

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

.brand-logo {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #000;
    flex-shrink: 0;
}

.brand-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.brand-subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}


/* ===========================================
   6. BALANCE CARD
   =========================================== */

.balance-section {
    margin-bottom: var(--space-8);
}

.balance-card {
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
}

.balance-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.balance-amount {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.balance-footer {
    margin-top: var(--space-3);
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}


/* ===========================================
   7. SUBSCRIPTION SECTION
   =========================================== */

.subscription-section {
    margin-bottom: var(--space-8);
}

.subscription-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
}

.subscription-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-5);
}

.subscription-tier-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.tier-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tier-name {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* Tier Badges */
.tier-badge {
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px var(--space-3);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tier-badge.free {
    background: #f3f4f6;
    color: #6b7280;
}

.tier-badge.basic {
    background: var(--accent-light);
    color: var(--accent-hover);
}

.tier-badge.pro {
    background: var(--warning-light);
    color: var(--warning);
}

.tier-badge.god {
    background: #f3e8ff;
    color: #7c3aed;
}

/* Subscription Features List */
.subscription-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
    padding: var(--space-4);
    background: var(--bg-subtle);
    border-radius: var(--radius-md);
}

.feature-row {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

.feature-row i {
    font-size: 1.1rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.feature-row .feature-status {
    margin-left: auto;
    font-size: 0.8rem;
    font-weight: 500;
}

.feature-row .feature-status.enabled {
    color: var(--success);
}

.feature-row .feature-status.disabled {
    color: var(--text-secondary);
}

/* Subscription Action Buttons */
.subscription-actions {
    display: flex;
    gap: var(--space-3);
}

.manage-btn,
.upgrade-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition-base);
}

.manage-btn {
    background: var(--bg-subtle);
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.manage-btn:hover {
    background: var(--bg-hover);
}

.manage-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.upgrade-btn {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    border: none;
    color: white;
}

.upgrade-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-accent);
}


/* ===========================================
   8. PLAN CARDS (Subscription)
   =========================================== */

.upgrade-options {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border);
}

/* Billing Toggle */
.billing-toggle {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-5);
    padding: var(--space-1);
    background: var(--bg-subtle);
    border-radius: var(--radius-md);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.billing-toggle button {
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    background: transparent;
    color: var(--text-secondary);
}

.billing-toggle button.active {
    background: white;
    color: var(--text-primary);
    box-shadow: var(--shadow-xs);
}

.billing-toggle button:hover:not(.active) {
    color: var(--text-primary);
}

.billing-toggle .save-badge {
    background: var(--success-light);
    color: var(--success);
    font-size: 0.7rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: var(--space-1);
}

/* Plans Grid */
.plans-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
}

/* Plan Card */
.plan-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    position: relative;
    transition: all var(--transition-base);
}

.plan-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
}

.plan-card.recommended {
    border-color: var(--accent);
}

.plan-card.recommended::before {
    content: 'Recommended';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--accent);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.plan-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.plan-price {
    display: flex;
    align-items: baseline;
    gap: var(--space-1);
    margin-bottom: var(--space-4);
}

.plan-price .amount {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.plan-price .period {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.plan-features {
    list-style: none;
    margin-bottom: var(--space-5);
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.9rem;
    margin-bottom: var(--space-2);
}

.plan-features li i {
    color: var(--success);
    flex-shrink: 0;
}

/* Plan Button */
.plan-btn {
    width: 100%;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-base);
}

.plan-btn.primary {
    background: var(--primary);
    border: none;
    color: white;
}

.plan-btn.primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.plan-btn.secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
}

.plan-btn.secondary:hover {
    background: var(--bg-subtle);
}

.plan-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}


/* ===========================================
   9. CREDIT PACK CARDS
   =========================================== */

.store-section {
    text-align: center;
}

.packs-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-10);
}

/* Pack Card */
.pack-card {
    background: var(--bg-card);
    border: 1.5px solid var(--border-hover);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    position: relative;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    text-align: left;
}

.pack-card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Popular Pack Variant */
.pack-card.popular {
    border: 2px solid var(--primary);
    background: linear-gradient(180deg, #f8fafc 0%, var(--bg-card) 60%);
    padding-top: var(--space-8);
}

.popular-badge {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 6px var(--space-3);
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: var(--space-1);
    box-shadow: var(--shadow-primary);
    white-space: nowrap;
}

/* Pack Layout */
.pack-top {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-4);
    align-items: start;
}

.pack-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: var(--bg-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 1.5rem;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.pack-card.popular .pack-icon {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.pack-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    min-width: 0;
}

.pack-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--space-3);
    flex-wrap: wrap;
}

.pack-name {
    font-weight: 700;
    font-size: 1.05rem;
    text-transform: capitalize;
    letter-spacing: -0.01em;
}

.pack-price {
    font-weight: 700;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Credits Display */
.pack-credits {
    display: flex;
    align-items: baseline;
    gap: 10px;
    color: var(--text-primary);
}

.credits-number {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1;
}

.credits-label {
    text-transform: uppercase;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
}

/* Pack Meta Info */
.pack-meta {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.meta-item i {
    font-size: 1rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

/* Buy Button */
.buy-btn {
    width: 100%;
    background: var(--primary);
    border: 1px solid var(--primary);
    color: white;
    font-weight: 600;
    padding: 14px;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: 1rem;
}

.buy-btn:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
}

.pack-card.popular .buy-btn {
    background: #0b1223;
    border-color: #0b1223;
    box-shadow: var(--shadow-primary);
}

.pack-card.popular .buy-btn:hover {
    background: var(--primary);
}

.buy-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}


/* ===========================================
   10. FEATURES GRID
   =========================================== */

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-10);
}

.feature-card {
    text-align: center;
}

.icon-box {
    width: 40px;
    height: 40px;
    background: var(--bg-subtle);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-3);
    color: var(--primary);
    font-size: 1.25rem;
}

.feature-card h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.feature-card p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
}


/* ===========================================
   11. FOOTER
   =========================================== */

.app-footer {
    border-top: 1px solid var(--border);
    padding-top: var(--space-6);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.footer-links {
    margin-top: var(--space-2);
}

.footer-links a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.footer-links a:hover {
    color: var(--text-primary);
}


/* ===========================================
   12. UTILITIES & STATES
   =========================================== */

/* Text Utilities */
.muted {
    color: var(--text-secondary);
}

.text-center {
    text-align: center;
}

/* Button Utilities */
.primary-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.95rem;
    transition: background var(--transition-fast);
    width: 100%;
}

.primary-btn:hover {
    background: var(--primary-hover);
}

.primary-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.ghost-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.ghost-btn:hover {
    background: var(--bg-subtle);
    color: var(--text-primary);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.9);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 50;
    backdrop-filter: blur(2px);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 0.8s linear infinite;
}

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

/* Visually Hidden (for accessibility) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}


/* ===========================================
   13. RESPONSIVE BREAKPOINTS
   =========================================== */

/* Tablet and up (480px+) */
@media (min-width: 480px) {
    .packs-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .plans-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        text-align: center;
    }
}

/* Mobile only (below 480px) */
@media (max-width: 479px) {
    .features-grid {
        gap: var(--space-6);
        text-align: left;
    }

    .feature-card {
        display: flex;
        align-items: flex-start;
        gap: var(--space-4);
        text-align: left;
    }

    .feature-card .icon-box {
        margin: 0;
        flex-shrink: 0;
    }

    .subscription-actions {
        flex-direction: column;
    }

    .billing-toggle {
        width: 100%;
    }

    .billing-toggle button {
        flex: 1;
    }
}

/* Small phones (below 360px) */
@media (max-width: 359px) {
    .page-shell {
        padding: 0 var(--space-3);
    }

    .app-container {
        padding: 0 var(--space-3) var(--space-8);
    }

    .pack-top {
        grid-template-columns: 1fr;
    }

    .pack-icon {
        display: none;
    }

    .login-features {
        flex-direction: column;
        gap: var(--space-3);
    }
}