/* Apple-like Design System - Foundation Styles */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --color-background: #FFFFFF;
    --color-primary: #007AFF;
    --color-primary-hover: #0051D5;
    --color-light-blue: #E3F2FD;
    --color-text: #1D1D1F;
    --color-text-secondary: #6E6E73;
    --color-border: #D1D1D6;
    --color-error: #FF3B30;
    --color-success: #34C759;
    
    /* Shadows */
    --shadow-small: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 4px 16px rgba(0, 0, 0, 0.15);
    
    /* Border Radius */
    --radius-small: 4px;
    --radius-medium: 8px;
    --radius-large: 12px;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.2s ease-in-out;
    --transition-slow: 0.3s ease-in-out;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Header */
.app-header {
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-small);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-header h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.language-toggle {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 14px;
    min-width: 60px;
}

.back-button {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 14px;
    min-width: 80px;
}

/* Main Content */
.app-main {
    flex: 1;
    padding: var(--spacing-xl);
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

/* Section Styles */
.floor-selection-section,
.date-selection-section,
.scheduler-view-section {
    margin-bottom: var(--spacing-xl);
}

section h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

/* Button Base Styles */
button {
    font-family: inherit;
    font-size: 15px;
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-medium);
    cursor: pointer;
    transition: all var(--transition-normal);
    background-color: var(--color-primary);
    color: white;
    min-height: 44px; /* Touch-friendly */
}

button:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-medium);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

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

button.secondary:hover {
    background-color: var(--color-light-blue);
}

button.danger {
    background-color: var(--color-error);
}

/* Input Base Styles */
input[type="text"],
input[type="email"],
input[type="date"],
input[type="number"],
select,
textarea {
    font-family: inherit;
    font-size: 15px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    background-color: var(--color-background);
    color: var(--color-text);
    transition: border-color var(--transition-normal);
    min-height: 44px;
    width: 100%;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-secondary);
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* Label Styles */
label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

/* Success Message */
.success-message {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--color-success);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-medium);
    font-size: 17px;
    font-weight: 500;
    box-shadow: var(--shadow-large);
    z-index: 10000;
    animation: fadeInOut 5s ease-in-out;
}

@keyframes fadeInOut {
    0%, 100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.9);
    }
    10%, 90% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-md {
    margin-top: var(--spacing-md);
}

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-background);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}