* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--text-color);
    background-color: var(--background-color);
    background-image:
        radial-gradient(circle at 10% 20%, rgba(124, 58, 237, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(236, 72, 153, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
    background-attachment: fixed;
    line-height: var(--line-height-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
    letter-spacing: -0.01em;
}

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

.main-content {
    flex: 1;
    padding: var(--spacing-lg);
}

/* Enhanced Typography */
h1 {
    font-family: var(--font-family-display);
    font-size: var(--font-size-display);
    font-weight: var(--font-weight-extrabold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
    color: var(--text-color);
}

h2 {
    font-family: var(--font-family-display);
    font-size: var(--font-size-xxxl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.015em;
    color: var(--text-color);
}

h3 {
    font-family: var(--font-family-display);
    font-size: var(--font-size-xxl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-normal);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.01em;
    color: var(--text-color);
}

h4 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-normal);
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

p {
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-weight: var(--font-weight-medium);
}

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

a:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Modern Button System */
.btn {
    padding: 14px 28px;
    min-height: var(--touch-target-comfortable);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    letter-spacing: -0.01em;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    user-select: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.1) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.btn:hover::before {
    opacity: 1;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    box-shadow: var(--box-shadow), 0 0 0 0 var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-large), var(--glow-primary);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--gradient-secondary);
    color: var(--text-white);
    box-shadow: var(--box-shadow);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-large), var(--glow-secondary);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color-light);
    color: var(--text-color);
    box-shadow: none;
}

.btn-outline:hover {
    border-color: var(--primary-color);
    background: rgba(124, 58, 237, 0.1);
    transform: translateY(-2px);
}

.btn-large {
    padding: 18px 36px;
    font-size: var(--font-size-lg);
    min-height: 56px;
    border-radius: var(--border-radius-large);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    pointer-events: none;
}

.btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Enhanced Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.password-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.password-input-wrapper input {
    padding-right: 50px;
}

.password-toggle {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    padding: 4px 8px;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.password-toggle:hover {
    opacity: 1;
}

.password-toggle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    min-height: var(--touch-target-comfortable);
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--text-color);
    transition: all var(--transition-base);
    appearance: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
    opacity: 0.6;
}

.form-group input:hover,
.form-group textarea:hover,
.form-group select:hover {
    border-color: var(--border-color-light);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--border-color-focus);
    box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.1);
    background: var(--background-light);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* Modern Cards */
.card {
    background: var(--card-background);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-large);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

/* Background images for general cards */
.card:nth-of-type(6n+1) {
    background-image: url('../assets/media/c1.png');
}

.card:nth-of-type(6n+2) {
    background-image: url('../assets/media/c2.png');
}

.card:nth-of-type(6n+3) {
    background-image: url('../assets/media/c3.png');
}

.card:nth-of-type(6n+4) {
    background-image: url('../assets/media/c4.png');
}

.card:nth-of-type(6n+5) {
    background-image: url('../assets/media/c5.png');
}

.card:nth-of-type(6n) {
    background-image: url('../assets/media/c6.png');
}

/* Gradient overlay for cards */
.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(10, 10, 15, 0.88) 0%, rgba(26, 26, 46, 0.92) 100%);
    transition: all var(--transition-base);
    z-index: 1;
}

/* Top gradient accent */
.card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-purple-pink);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 2;
}

.card > * {
    position: relative;
    z-index: 3;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--box-shadow-large);
    border-color: var(--border-color-light);
}

.card:hover::before {
    background: linear-gradient(135deg, rgba(10, 10, 15, 0.80) 0%, rgba(26, 26, 46, 0.85) 100%);
}

.card:hover::after {
    opacity: 1;
}

/* Status Messages */
.error-message {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--error-color);
    border-left-width: 4px;
    color: var(--error-light);
    padding: 14px 18px;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: 10px;
}

.success-message {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid var(--success-color);
    border-left-width: 4px;
    color: var(--success-light);
    padding: 14px 18px;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: 10px;
}

.warning-message {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid var(--warning-color);
    border-left-width: 4px;
    color: var(--warning-light);
    padding: 14px 18px;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-lg);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Loading Spinner */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Responsive - Mobile First */
@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-md);
    }

    h1 {
        font-size: var(--font-size-xxl);
        line-height: 1.2;
    }

    h2 {
        font-size: var(--font-size-xl);
        line-height: 1.3;
    }

    h3 {
        font-size: var(--font-size-lg);
        line-height: 1.3;
    }

    .btn {
        width: 100%;
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-base);
    }

    .btn-large {
        min-height: 52px;
        font-size: var(--font-size-lg);
        padding: var(--spacing-md) var(--spacing-xl);
        font-weight: 700;
    }

    .card {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-md);
    }

    .form-group {
        margin-bottom: var(--spacing-md);
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        font-size: 16px; /* Prevents zoom on iOS */
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    .main-content {
        padding: var(--spacing-sm);
    }

    h1 {
        font-size: 22px;
    }

    h2 {
        font-size: 19px;
    }

    h3 {
        font-size: 17px;
    }

    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }

    .btn-large {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-base);
        min-height: 48px;
    }

    .card {
        padding: var(--spacing-md);
    }
}

/* Touch device optimization */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
    }

    .btn:active {
        transform: scale(0.98);
    }

    .card:hover {
        transform: none;
    }
}