/* ==========================================================================
   ESAIP - Shibboleth IdP 4.x - Charte Graphique 2024
   École d'Ingénieurs La Salle
   
   Couleurs charte :
     Bleu principal :  #3878BD
     Bleu foncé :      #242756
     Vert :            #3AAE70
     Rouge :           #E83C45
     Orange :          #F6A02A
     Blanc :           #FFFFFF
   
   Typographies charte :
     Titres :          Nagel VF (fallback: Avant Garde Gothic, sans-serif)
     Sous-titres :     ITC Avant Garde Gothic Pro Medium
     Corps :           Lucida Sans / Lucida Sans Regular
   ========================================================================== */

/* --- Google Fonts fallback (web-safe approximation) --- */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,700;1,9..40,400&display=swap');

/* --- CSS Custom Properties --- */
:root {
    /* Couleurs ESAIP */
    --esaip-bleu:        #3878BD;
    --esaip-bleu-fonce:  #242756;
    --esaip-vert:        #3AAE70;
    --esaip-rouge:       #E83C45;
    --esaip-orange:      #F6A02A;
    --esaip-blanc:       #FFFFFF;
    --esaip-gris-clair:  #F4F6F9;
    --esaip-gris:        #8B95A5;
    --esaip-gris-fonce:  #4A5568;
    --esaip-noir:        #1A1D2E;

    /* Spacing */
    --space-xs:   0.25rem;
    --space-sm:   0.5rem;
    --space-md:   1rem;
    --space-lg:   1.5rem;
    --space-xl:   2rem;
    --space-2xl:  3rem;
    --space-3xl:  4rem;

    /* Border radius */
    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  16px;
    --radius-xl:  24px;

    /* Shadows */
    --shadow-sm:  0 1px 3px rgba(36, 39, 86, 0.06);
    --shadow-md:  0 4px 16px rgba(36, 39, 86, 0.08);
    --shadow-lg:  0 8px 32px rgba(36, 39, 86, 0.12);
    --shadow-xl:  0 16px 48px rgba(36, 39, 86, 0.16);

    /* Transitions */
    --transition-fast:   150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base:   250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow:   400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'DM Sans', 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', sans-serif;
    color: var(--esaip-noir);
    background: var(--esaip-blanc);
    line-height: 1.6;
    min-height: 100vh;
}

/* --- Page Layout --- */
.esaip-page {
    display: flex;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

/* --- Left Panel: Visual / Branding --- */
.esaip-branding {
    flex: 0 0 33.333%;
    max-width: 33.333%;
    background: var(--esaip-bleu);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-2xl);
    overflow: hidden;
}

/* Geometric pattern overlay inspired by ESAIP's dot/circle motifs */
.esaip-branding::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.08) 2px, transparent 2px),
        radial-gradient(circle at 60% 40%, rgba(255,255,255,0.06) 3px, transparent 3px),
        radial-gradient(circle at 80% 70%, rgba(255,255,255,0.07) 2px, transparent 2px),
        radial-gradient(circle at 40% 80%, rgba(255,255,255,0.05) 4px, transparent 4px);
    background-size: 80px 80px, 120px 120px, 100px 100px, 140px 140px;
    pointer-events: none;
    z-index: 1;
}

/* Decorative circles (inspired by ESAIP's iconographic patterns) */
.esaip-branding::after {
    content: '';
    position: absolute;
    bottom: -60px;
    right: -60px;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    border: 30px solid rgba(255, 255, 255, 0.05);
    pointer-events: none;
    z-index: 1;
}

.esaip-branding-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--esaip-blanc);
}

.esaip-logo {
    width: 180px;
    height: auto;
    margin-bottom: var(--space-2xl);
    filter: brightness(0) invert(1);
    transition: transform var(--transition-slow);
}

.esaip-logo:hover {
    transform: scale(1.03);
}

.esaip-branding-title {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
    line-height: 1.3;
}

.esaip-branding-subtitle {
    font-size: 0.88rem;
    font-weight: 400;
    opacity: 0.8;
    line-height: 1.6;
    max-width: 280px;
    margin: 0 auto;
}

/* Decorative element: floating circle top-left */
.esaip-deco-circle {
    position: absolute;
    top: 60px;
    left: -50px;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: rgba(58, 174, 112, 0.15);
    z-index: 1;
}

.esaip-deco-circle-2 {
    position: absolute;
    top: 40%;
    right: -50px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(246, 160, 42, 0.1);
    z-index: 1;
}

/* Federation badge */
.esaip-federation-badge {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.esaip-federation-badge svg {
    width: 16px;
    height: 16px;
    fill: var(--esaip-blanc);
    opacity: 0.8;
}

.esaip-federation-badge span {
    font-size: 0.75rem;
    color: var(--esaip-blanc);
    opacity: 0.8;
    white-space: nowrap;
}

/* --- Right Panel: Login Form --- */
.esaip-login-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-2xl);
    background: var(--esaip-blanc);
    position: relative;
}

/* Subtle background pattern */
.esaip-login-panel::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(56, 120, 189, 0.03), transparent 70%);
    pointer-events: none;
}

.esaip-login-container {
    width: 100%;
    max-width: 400px;
    position: relative;
    z-index: 2;
}

/* --- SP Info (Service demandeur) --- */
.esaip-sp-info {
    margin-bottom: var(--space-xl);
    padding: var(--space-md) var(--space-lg);
    background: var(--esaip-gris-clair);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--esaip-bleu);
}

.esaip-sp-info-label {
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--esaip-gris);
    margin-bottom: var(--space-xs);
}

.esaip-sp-info-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--esaip-bleu-fonce);
}

.esaip-sp-info-details {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.esaip-sp-logo {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--esaip-blanc);
    border-radius: var(--radius-sm);
    border: 1px solid #E2E8F0;
    overflow: hidden;
}

.esaip-sp-logo img {
    max-width: 36px;
    max-height: 36px;
    object-fit: contain;
}

.esaip-sp-text {
    flex: 1;
    min-width: 0;
}

.esaip-sp-info-desc {
    font-size: 0.78rem;
    color: var(--esaip-gris-fonce);
    line-height: 1.4;
    margin-top: 2px;
}

/* --- Login Heading --- */
.esaip-login-heading {
    margin-bottom: var(--space-2xl);
}

.esaip-login-heading h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--esaip-bleu-fonce);
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

.esaip-login-heading p {
    font-size: 0.9rem;
    color: var(--esaip-gris-fonce);
    line-height: 1.5;
}

/* --- Form Elements --- */
.esaip-form-group {
    margin-bottom: var(--space-lg);
    position: relative;
}

.esaip-form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--esaip-bleu-fonce);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.01em;
}

.esaip-form-input {
    width: 100%;
    padding: 0.8rem 1rem;
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--esaip-noir);
    background: var(--esaip-blanc);
    border: 2px solid #E2E8F0;
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.esaip-form-input::placeholder {
    color: var(--esaip-gris);
    font-weight: 400;
}

.esaip-form-input:hover {
    border-color: #CBD5E0;
}

.esaip-form-input:focus {
    border-color: var(--esaip-bleu);
    box-shadow: 0 0 0 3px rgba(56, 120, 189, 0.15);
}

.esaip-form-input.error {
    border-color: var(--esaip-rouge);
    box-shadow: 0 0 0 3px rgba(232, 60, 69, 0.1);
}

/* --- Checkbox --- */
.esaip-checkbox-group {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.esaip-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--esaip-bleu);
    cursor: pointer;
    border-radius: 4px;
}

.esaip-checkbox-label {
    font-size: 0.85rem;
    color: var(--esaip-gris-fonce);
    cursor: pointer;
    user-select: none;
}

/* --- Submit Button --- */
.esaip-btn-submit {
    width: 100%;
    padding: 0.7rem 1.5rem;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--esaip-blanc);
    background: var(--esaip-bleu);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.01em;
}

.esaip-btn-submit::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transition: left 0.5s ease;
}

.esaip-btn-submit:hover {
    background: var(--esaip-bleu-fonce);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.esaip-btn-submit:hover::after {
    left: 100%;
}

.esaip-btn-submit:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.esaip-btn-submit:disabled {
    background: var(--esaip-gris);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* --- Error Message --- */
.esaip-error-banner {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-left: 4px solid var(--esaip-rouge);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
    animation: esaip-slideDown 0.3s ease-out;
}

.esaip-error-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    margin-top: 1px;
}

.esaip-error-icon svg {
    width: 20px;
    height: 20px;
    fill: var(--esaip-rouge);
}

.esaip-error-text {
    font-size: 0.85rem;
    color: #991B1B;
    line-height: 1.5;
}

.esaip-error-text strong {
    display: block;
    font-weight: 600;
    margin-bottom: 2px;
}

/* --- Warning Message --- */
.esaip-warning-banner {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: #FFFBEB;
    border: 1px solid #FDE68A;
    border-left: 4px solid var(--esaip-orange);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
    animation: esaip-slideDown 0.3s ease-out;
}

.esaip-warning-text {
    font-size: 0.85rem;
    color: #92400E;
    line-height: 1.5;
}

/* --- Success Message --- */
.esaip-success-banner {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: #F0FDF4;
    border: 1px solid #BBF7D0;
    border-left: 4px solid var(--esaip-vert);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-xl);
    animation: esaip-slideDown 0.3s ease-out;
}

.esaip-success-text {
    font-size: 0.85rem;
    color: #166534;
    line-height: 1.5;
}

/* --- Help Links --- */
.esaip-help-links {
    margin-top: var(--space-md);
    text-align: center;
}

.esaip-help-links a {
    font-size: 0.85rem;
    color: var(--esaip-bleu);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.esaip-help-links a:hover {
    color: var(--esaip-bleu-fonce);
    text-decoration: underline;
}

/* --- Footer --- */
.esaip-footer {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    width: 100%;
    padding: 0 var(--space-xl);
}

.esaip-footer p {
    font-size: 0.72rem;
    color: var(--esaip-gris);
    line-height: 1.5;
}

.esaip-footer a {
    color: var(--esaip-bleu);
    text-decoration: none;
}

.esaip-footer a:hover {
    text-decoration: underline;
}

/* --- Logout Page --- */
.esaip-logout-content {
    text-align: center;
}

.esaip-logout-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-xl);
    background: var(--esaip-gris-clair);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.esaip-logout-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--esaip-vert);
}

.esaip-btn-secondary {
    display: inline-block;
    padding: 0.7rem 1.8rem;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--esaip-bleu);
    background: transparent;
    border: 2px solid var(--esaip-bleu);
    border-radius: var(--radius-md);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-fast);
    margin-top: var(--space-lg);
}

.esaip-btn-secondary:hover {
    background: var(--esaip-bleu);
    color: var(--esaip-blanc);
}

/* --- Extended Auth Flows --- */
.esaip-ext-auth {
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid #E2E8F0;
}

.esaip-ext-auth-label {
    font-size: 0.8rem;
    color: var(--esaip-gris);
    text-align: center;
    margin-bottom: var(--space-md);
}

.esaip-btn-ext {
    width: 100%;
    padding: 0.7rem 1rem;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--esaip-bleu-fonce);
    background: var(--esaip-gris-clair);
    border: 2px solid #E2E8F0;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--space-sm);
}

.esaip-btn-ext:hover {
    border-color: var(--esaip-bleu);
    background: rgba(56, 120, 189, 0.05);
}

/* --- Animations --- */
@keyframes esaip-slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes esaip-fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.esaip-login-container {
    animation: esaip-fadeIn 0.5s ease-out;
}

/* --- Mobile Logo (visible only on small screens) --- */
.esaip-mobile-logo {
    display: none;
    width: 160px;
    height: auto;
    margin-bottom: var(--space-xl);
}

/* --- Responsive --- */
@media screen and (max-width: 900px) {
    .esaip-page {
        flex-direction: column;
    }

    .esaip-branding {
        flex: none;
        max-width: 100%;
        padding: var(--space-2xl) var(--space-xl);
        min-height: auto;
    }

    .esaip-branding-title {
        font-size: 1.3rem;
    }

    .esaip-branding-subtitle {
        display: none;
    }

    .esaip-deco-circle,
    .esaip-deco-circle-2 {
        display: none;
    }

    .esaip-federation-badge {
        position: relative;
        bottom: auto;
        left: auto;
        transform: none;
        margin-top: var(--space-lg);
    }

    .esaip-login-panel {
        padding: var(--space-xl);
        justify-content: flex-start;
        padding-top: var(--space-2xl);
    }

    .esaip-footer {
        position: relative;
        bottom: auto;
        left: auto;
        transform: none;
        margin-top: var(--space-3xl);
    }
}

@media screen and (max-width: 480px) {
    .esaip-branding {
        padding: var(--space-xl) var(--space-md);
    }

    .esaip-branding .esaip-logo {
        width: 160px;
    }

    .esaip-login-panel {
        padding: var(--space-lg) var(--space-md);
    }

    .esaip-login-heading h1 {
        font-size: 1.4rem;
    }
}

/* --- Print --- */
@media print {
    .esaip-branding {
        display: none;
    }

    .esaip-login-panel {
        width: 100%;
    }
}