/* ============================================
   CaloCalc Support Form - Design System
   Mobile-first responsive design
   ============================================ */

/* ============================================
   CSS VARIABLES - Design Tokens
   ============================================ */
:root {
    /* Couleurs primaires */
    --color-primary: #45599f;
    --color-accent: #ffb347;
    --color-accent-green: #44b347;

    /* Fond */
    --color-bg: #f2f2f7;
    --color-white: #ffffff;
    --color-card-bg: #f5f7ff;
    --color-input-bg: #eef0fb;

    /* Texte */
    --color-text-dark: #0d0d0d;
    --color-text-muted: #6b7280;

    /* Sémantique */
    --color-danger: #dc2626;
    --color-success: #10b981;
    --color-warning: #f59e0b;

    /* Bordures */
    --color-border: #e2e4eb;
    --color-border-alt: #e4e6ef;

    /* Overlay */
    --color-overlay: rgba(0, 0, 0, 0.35);

    /* Espacements */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    --spacing-xxxl: 28px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 18px;
    --radius-xxl: 20px;
    --radius-xxxl: 24px;
    --radius-pill: 999px;

    /* Typographie */
    --font-size-xs: 11px;
    --font-size-sm: 12px;
    --font-size-md: 14px;
    --font-size-base: 15px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-xxl: 20px;
    --font-size-xxxl: 24px;
    --font-size-display: 32px;

    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Ombres */
    --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 4px 8px rgba(0, 0, 0, 0.08);
    --shadow-heavy: 0 12px 16px rgba(0, 0, 0, 0.12);
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-dark);
    font-size: var(--font-size-base);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
}

/* ============================================
   LOADER
   ============================================ */
.loader-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    gap: var(--spacing-lg);
}

.loader {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loader-container p {
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

/* ============================================
   ERROR CONTAINER
   ============================================ */
.error-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--spacing-xl);
}

.error-card {
    background-color: var(--color-white);
    border-radius: var(--radius-xxxl);
    padding: var(--spacing-xxxl);
    text-align: center;
    max-width: 420px;
    width: 100%;
    box-shadow: var(--shadow-heavy);
}

.error-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-lg);
}

.error-card h2 {
    font-size: var(--font-size-xxl);
    font-weight: var(--font-weight-bold);
    color: var(--color-danger);
    margin-bottom: var(--spacing-md);
}

.error-card p {
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.error-detail {
    color: var(--color-text-muted);
    font-size: var(--font-size-md);
}

/* ============================================
   CONTAINER & LAYOUT
   ============================================ */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    min-height: 100vh;
}

.hidden {
    display: none !important;
}

/* ============================================
   LOGO
   ============================================ */
.logo-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xxl);
    margin-top: var(--spacing-lg);
}

.logo-placeholder {
    width: 80px;
    height: 80px;
}

/* ============================================
   HEADER
   ============================================ */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xxxl);
}

.header h1 {
    font-size: var(--font-size-xxxl);
    font-weight: var(--font-weight-extrabold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    line-height: 1.6;
}

/* ============================================
   FORM CARD
   ============================================ */
.form-card {
    background-color: var(--color-white);
    border-radius: var(--radius-xxxl);
    padding: var(--spacing-xxxl);
    box-shadow: var(--shadow-heavy);
    border: 1px solid var(--color-border-alt);
}

/* ============================================
   FORM SECTIONS
   ============================================ */
.form-section {
    margin-bottom: var(--spacing-xxxl);
}

.form-section:last-of-type {
    margin-bottom: 0;
}

.section-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

/* ============================================
   FORM GROUPS
   ============================================ */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-dark);
    margin-bottom: var(--spacing-sm);
}

.required {
    color: var(--color-danger);
}

/* ============================================
   FORM INPUTS
   ============================================ */
.form-input,
.form-select,
.form-textarea {
    width: 100%;
    background-color: var(--color-input-bg);
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    padding: 14px 16px;
    font-size: var(--font-size-base);
    color: var(--color-text-dark);
    font-family: inherit;
    transition: all 0.2s ease;
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    background-color: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(69, 89, 159, 0.1);
}

.form-input[readonly] {
    background-color: var(--color-bg);
    color: var(--color-text-muted);
    cursor: not-allowed;
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.6;
}

.form-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

/* ============================================
   SELECT WRAPPER
   ============================================ */
.select-wrapper {
    position: relative;
}

.form-select {
    appearance: none;
    padding-right: 40px;
    cursor: pointer;
    font-weight: var(--font-weight-semibold);
}

.select-icon {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

/* ============================================
   FORM ACTIONS
   ============================================ */
.form-actions {
    margin-top: var(--spacing-xxl);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    width: 100%;
    border: none;
    border-radius: var(--radius-xl);
    padding: 16px 24px;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-medium);
}

.btn-primary:hover:not(:disabled) {
    background-color: #3a4b87;
    box-shadow: var(--shadow-heavy);
    transform: translateY(-2px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-light);
}

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

.btn-loader {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ============================================
   FORM MESSAGES
   ============================================ */
.form-message {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-medium);
    text-align: center;
}

.form-message.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.form-message.error {
    background-color: rgba(220, 38, 38, 0.1);
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    text-align: center;
    margin-top: var(--spacing-xxxl);
    padding-top: var(--spacing-xl);
}

.footer p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ============================================
   RESPONSIVE - TABLET
   ============================================ */
@media screen and (min-width: 640px) {
    .container {
        padding: var(--spacing-xxxl);
    }

    .form-card {
        padding: 32px;
    }

    .logo-container {
        margin-top: var(--spacing-xxl);
    }
}

/* ============================================
   RESPONSIVE - DESKTOP
   ============================================ */
@media screen and (min-width: 1024px) {
    .header h1 {
        font-size: var(--font-size-display);
    }

    .form-card {
        padding: 40px;
    }

    .btn:hover:not(:disabled) {
        transform: translateY(-1px);
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus visible pour accessibilité clavier */
.btn:focus-visible,
.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}