/* --- VARIABLES ET RESET --- */
:root {
    --primary: #2B4D9A;
    --primary-dark: #1f3a75;
    --glass-bg: rgba(255, 255, 255, 0.95);
    --glass-border: rgba(255, 255, 255, 0.5);
    --text-main: #334155;
    --text-muted: #64748b;
    --bg-gradient: linear-gradient(135deg, #e7eaf2 0%, #f1f5f9 50%, #f9fafb 100%);
    
    --auth-width: 450px; 
    
    --shadow-blue: 0 1.5vh 3.5vh rgba(43, 77, 154, 0.25);
    --shadow-blue-hover: 0 2.5vh 5vh rgba(43, 77, 154, 0.35);
    --shadow-button: 0 1vh 2vh rgba(43, 77, 154, 0.2);
    --shadow-standard: 0 2vh 4vh rgba(0, 0, 0, 0.05);
    --shadow-elevated: 0 3vh 6vh rgba(0, 0, 0, 0.08);
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center; 
}

/* --- BLOC LOGO --- */
.login-header-logo {
    background-color: var(--primary);
    width: var(--auth-width); 
    padding: 1.5rem 1rem;
    text-align: center;
    border-radius: 2rem;
    box-sizing: border-box;
    margin-top: 15vh;
    margin-bottom: 1.5rem; 
    border: 0.1rem solid var(--primary-dark);
    box-shadow: var(--shadow-blue);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 2;
}

.login-header-logo.fade-out {
    animation: fadeOut 0.25s ease-in forwards;
}

.login-header-logo:hover {
    transform: translateY(-0.5vh);
    box-shadow: var(--shadow-blue-hover);
}

.login-header-logo img {
    height: 60px;
    transition: transform 0.3s ease;
    cursor: pointer;
    animation: elasticLanding 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    transform-origin: center;
}

.login-header-logo img:hover { 
    transform: scale(1.1); 
}

/* --- WRAPPER --- */
.login-wrapper {
    width: var(--auth-width);
    display: flex;
    flex-direction: column;
    align-items: center; 
    animation: fadeIn 0.5s ease-out forwards;
    position: relative; /* Référence pour le message d'erreur absolute */
}

.login-wrapper.fade-out {
    animation: fadeOut 0.25s ease-in forwards;
}

/* --- CONTAINER LOGIN --- */
.login-container {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 0.1rem solid var(--glass-border);
    border-radius: 2rem;
    width: 100%; 
    overflow: hidden;
    box-shadow: var(--shadow-standard);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 1;
}

.login-container:hover {
    transform: translateY(-0.5vh);
    box-shadow: var(--shadow-elevated);
}

.login-content { 
    padding: 2rem; 
}

/* --- ONGLETS (TABS) --- */
.login-tabs {
    display: flex;
    position: relative;
    background: #f1f5f9;
    border-radius: 1rem;
    padding: 5px;
    margin-bottom: 2rem;
    border: 1px solid var(--glass-border);
    z-index: 1;
}

.tab-indicator {
    position: absolute;
    top: 5px;
    left: 5px;
    width: calc(50% - 5px);
    height: calc(100% - 10px);
    background: var(--primary);
    border-radius: 0.8rem;
    box-shadow: 0 0.5vh 1.5vh rgba(43, 77, 154, 0.2);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 0;
}

.tab-btn {
    flex: 1;
    position: relative;
    z-index: 1;
    border: none;
    background: transparent;
    padding: 10px;
    font-weight: 700;
    cursor: pointer;
    border-radius: 0.8rem;
    color: var(--text-muted);
    transition: color 0.3s ease;
    font-size: 0.85rem;
    text-align: center;
}

.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: white; }

.login-tabs:has(.tab-btn:nth-child(3).active) .tab-indicator {
    transform: translateX(100%);
}

h2 {
    text-align: center;
    color: var(--text-main);
    font-size: 1.15rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

/* --- FORMULAIRE ET INPUTS --- */
.input-field { 
    margin-bottom: 1.2rem; 
}

label {
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
    margin-left: 0.5rem;
    text-transform: uppercase;
}

input {
    width: 100%;
    padding: 10px 40px 10px 15px;
    border-radius: 1rem;
    border: 1px solid rgba(0,0,0,0.1);
    background: rgba(255,255,255,0.8);
    font-size: 0.95rem;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(43, 77, 154, 0.1);
}

.input-wrapper { 
    position: relative; 
}

.input-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    opacity: 0.4;
}

.forgot-password {
    display: block;
    text-align: right;
    font-size: 0.8rem;
    color: var(--primary);
    text-decoration: none;
    margin-top: -8px;
    margin-bottom: 20px;
}

.forgot-password:hover { 
    text-decoration: underline; 
}

/* --- BOUTONS --- */
.btn-primaire {
    width: 100%;
    padding: 14px;
    border-radius: 1rem;
    border: none;
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    margin-bottom: 12px;
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-button);
    transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.btn-secondaire {
    display: block;
    width: 100%;
    padding: 14px;
    border-radius: 1rem;
    border: 1px solid rgba(0,0,0,0.1);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    background: transparent;
    color: var(--text-muted);
    overflow: hidden;
    max-height: 60px;
    opacity: 1;
    transition: all 0.3s ease;
}

.btn-primaire:hover {
    background: var(--primary-dark);
    transform: scale(1.03);
    box-shadow: 0 1.2vh 2.5vh rgba(43, 77, 154, 0.3);
}

.btn-secondaire:hover {
    background: white;
    color: var(--primary);
    border-color: var(--primary);
    transform: scale(1.03);
}

.btn-hidden {
    max-height: 0 !important;
    opacity: 0 !important;
    margin-bottom: 0 !important;
    padding: 0 !important;
    border: 0 !important;
    pointer-events: none;
}

/* --- MESSAGE D'ERREUR --- */
.error-message {
    position: absolute;
    bottom: calc(100% + 18.5vh); /* Placé au-dessus du logo */
    width: 100%;
    box-sizing: border-box;
    background: #fee2e2;
    color: #b91c1c;
    padding: 1rem;
    border: 1px solid #b91c1c;
    border-radius: 1rem;
    text-align: center;
    font-size: 1rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.1s ease;
    z-index: 10;
}

.error-message.show {
    opacity: 1;
    animation: shakeError 0.2s cubic-bezier(.36,.07,.19,.97) forwards;
}

.error-message.hide {
    animation: fadeOut 0.5s ease-in forwards;
}

/* --- ANIMATIONS (KEYFRAMES) --- */

@keyframes shakeError {
    0% { transform: translateX(0); opacity: 1; }
    15% { transform: translateX(-10px); }
    30% { transform: translateX(8px); }
    45% { transform: translateX(-6px); }
    60% { transform: translateX(4px); }
    100% { transform: translateX(0); opacity: 1; }
}

@keyframes elasticLanding {
    0% { transform: scale(1); }
    25% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-15px); }
}

/* État au moment de la pression (mousedown) */
.login-header-logo img,.login-container:has(.forgot-password:active),
.login-container:has(.btn-primaire:active),
.login-container:has(.btn-secondaire:active){
        transform: translateY(0vh);
    
    /* Optionnel : on réduit l'ombre pour accentuer l'effet d'écrasement */
    box-shadow: 0 0.5vh 1vh rgba(0, 0, 0, 0.05);
    
    /* On réduit légèrement la durée de transition pour que ce soit "nerveux" */
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}