/* Digital Minimalism Theme - Input Intelligence Styles */

:root {
    /* Monochromatic palette */
    --color-primary: #000000;
    --color-secondary: #666666;
    --color-tertiary: #999999;
    --color-background: #ffffff;
    --color-surface: #f8f8f8;
    --color-border: #e5e5e5;
    --color-error: #000000;
    --color-success: #000000;
    --color-warning: #666666;
    
    /* Spacing system */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 4rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'SF Mono', Monaco, Consolas, monospace;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 2rem;
    
    /* Animation */
    --transition-base: 0.2s ease;
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-primary);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 480px;
    padding: var(--space-lg);
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--space-xxl);
}

.title {
    font-size: var(--font-size-xl);
    font-weight: 300;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-xs);
}

.subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    font-weight: 400;
}

/* Form Layout */
.intelligent-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

/* Input Groups */
.input-group {
    position: relative;
}

.input-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--space-xs);
    color: var(--color-primary);
    transition: color var(--transition-base);
}

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

/* Intelligent Input */
.intelligent-input {
    width: 100%;
    padding: var(--space-sm) 0;
    font-size: var(--font-size-base);
    font-family: inherit;
    border: none;
    border-bottom: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-primary);
    transition: border-color var(--transition-base);
    outline: none;
}

.intelligent-input::placeholder {
    color: var(--color-tertiary);
}

.intelligent-input:focus {
    border-bottom-color: var(--color-primary);
}

.intelligent-input.valid {
    border-bottom-color: var(--color-primary);
}

.intelligent-input.invalid {
    border-bottom-color: var(--color-primary);
}

/* Input Progress */
.input-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 1px;
    background-color: var(--color-primary);
    transition: width var(--transition-slow);
    width: 0;
}

.input-group.active .input-progress {
    width: 100%;
}

/* Input Indicator */
.input-indicator {
    position: absolute;
    right: 0;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-border);
    transition: all var(--transition-base);
    opacity: 0;
}

.input-group.valid .input-indicator {
    background-color: var(--color-primary);
    opacity: 1;
}

.input-group.invalid .input-indicator {
    background-color: var(--color-primary);
    opacity: 1;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.5; }
}

/* Hints and Errors */
.input-hint {
    font-size: var(--font-size-sm);
    color: var(--color-tertiary);
    margin-top: var(--space-xs);
    transition: opacity var(--transition-base);
}

.input-error {
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--space-xs);
    opacity: 0;
    transform: translateY(-4px);
    transition: all var(--transition-base);
    position: absolute;
}

.input-error.visible {
    opacity: 1;
    transform: translateY(0);
    position: static;
}

/* Suggestions */
.suggestions-list {
    position: absolute;
    top: calc(100% + var(--space-xs));
    left: 0;
    right: 0;
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-base);
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.suggestions-list.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.suggestion-item {
    padding: var(--space-sm);
    cursor: pointer;
    transition: background-color var(--transition-base);
    font-size: var(--font-size-sm);
}

.suggestion-item:hover,
.suggestion-item.selected {
    background-color: var(--color-surface);
}

/* Card Type Indicator */
.card-type {
    position: absolute;
    right: 0;
    font-size: var(--font-size-sm);
    font-family: var(--font-mono);
    color: var(--color-secondary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card-type.visible {
    opacity: 1;
}

/* Password Toggle */
.password-toggle {
    position: absolute;
    right: 0;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-xs);
    color: var(--color-secondary);
    transition: color var(--transition-base);
}

.password-toggle:hover {
    color: var(--color-primary);
}

.password-toggle-icon::before {
    content: '👁';
    font-size: var(--font-size-lg);
    filter: grayscale(1);
}

.password-toggle.visible .password-toggle-icon::before {
    content: '👁‍🗨';
}

/* Password Strength */
.password-strength {
    margin-top: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.password-strength.visible {
    opacity: 1;
}

.strength-meter {
    flex: 1;
    height: 2px;
    background-color: var(--color-border);
    border-radius: 1px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    background-color: var(--color-primary);
    transition: width var(--transition-slow);
    width: 0;
}

.strength-text {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    min-width: 80px;
    text-align: right;
}

/* Form Progress */
.form-progress {
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.progress-bar {
    height: 2px;
    background-color: var(--color-surface);
    border-radius: 1px;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.progress-fill {
    height: 100%;
    background-color: var(--color-primary);
    transition: width var(--transition-slow);
}

.progress-text {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    text-align: center;
}

/* Submit Button */
.submit-button {
    margin-top: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    font-family: inherit;
    background-color: var(--color-primary);
    color: var(--color-background);
    border: none;
    border-radius: 2px;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.submit-button:disabled {
    background-color: var(--color-surface);
    color: var(--color-tertiary);
    cursor: not-allowed;
}

.submit-button:not(:disabled):hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.submit-button:not(:disabled):active {
    transform: translateY(0);
    box-shadow: none;
}

.button-loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-background);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    opacity: 0;
}

.submit-button.loading .button-text {
    opacity: 0;
}

.submit-button.loading .button-loader {
    opacity: 1;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Footer Stats */
.footer {
    margin-top: var(--space-xxl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.stat-value {
    font-size: var(--font-size-lg);
    font-weight: 300;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: var(--space-md);
    }
    
    .title {
        font-size: 1.5rem;
    }
    
    .intelligent-form {
        gap: var(--space-lg);
    }
}