/* ============================================
   VARIABLES ET COULEURS PRINCIPALES
   ============================================ */
:root {
    --color-clear-red: #F88888;
    --color-red: #D36A6A;
    --color-clear-yel: #FDE896;
    --color-yel: #F3D250;
    --color-gre: #ECECEC;
    --color-clear-blue: #90CCF4;
    --color-blue: #5DA2D5;
    
    /* Couleurs neutres */
    --color-dark: #2c3e50;
    --color-light: #ecf0f1;
    --color-white: #ffffff;
    --color-gray: #95a5a6;
    --color-border: #ddd;
    
    /* Espaces */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Typographie */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* ============================================
   RESET ET STYLES GLOBAUX
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   STRUCTURE PRINCIPALE
   ============================================ */
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--color-blue);
    border-bottom: 2px solid var(--color-blue);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

section {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

section:first-of-type {
    max-height: 100px;
}

form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    max-width: 500px;
}

form p {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin: 0;
}

form p label {
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 0;
}

form p input,
form p textarea,
form p select {
    margin: 0;
}

label {
    font-weight: 600;
    display: block;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"],
input[type="number"],
textarea,
select {
    padding: var(--spacing-sm);
    border: 1px solid var(--color-blue);
    border-radius: 0.5rem;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    width: 100%;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="date"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-blue);
    box-shadow: 0 0 0 3px rgba(93, 162, 213, 0.1);
}

input[type="checkbox"],
input[type="radio"] {
    width: auto;
    margin-right: var(--spacing-xs);
    cursor: pointer;
}

footer {
    background-color: var(--color-dark);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    border-top: 2px solid var(--color-blue);
}

footer p {
    margin: 0;
}

/* ============================================
   NAVIGATION
   ============================================ */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

nav > div {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* ============================================
   HEADINGS
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-dark);
    align-self: center;
}

h1 {
    font-size: var(--font-size-2xl);
}

h2 {
    font-size: var(--font-size-xl);
}

h3 {
    font-size: var(--font-size-lg);
}

/* ============================================
   MESSAGES ET ALERTES
   ============================================ */
.message-success, 
.message-error, 
.message-warning, 
.message-info {
    padding: var(--spacing-sm);
    border-radius: 0.5rem;
    border: 4px solid;
}

.message-success {
    background-color: #d4edda;
    color: #155724;
    border-color: #28a745;
}

.message-error {
    background-color: #f8d7da;
    color: #721c24;
    border-color: var(--color-red);
}

.message-warning {
    background-color: #fff3cd;
    color: #856404;
    border-color: var(--color-yel);
}

.message-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-color: var(--color-clear-blue);
}

/* ============================================
BUTTONS
============================================ */

.btn-form-container {
    display: flex;
    justify-content: space-between;
}

.btn {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    text-align: center;
    align-content: center;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    transition: var(--transition);
}

.btn-ble {
    color: var(--color-white);
    background-color: var(--color-blue);
    border: 2px solid var(--color-blue);
}

.btn-ble:hover {
    background-color: var(--color-clear-blue);
}

.btn-yel {
    color: var(--color-dark);
    background-color: var(--color-yel);
    border: 2px solid var(--color-yel);
}

.btn-yel:hover {
    background-color: var(--color-clear-yel);
}

.btn-red {
    color: var(--color-white);
    background-color: var(--color-red);
    border: 2px solid var(--color-red);
}

.btn-red:hover {
    background-color: var(--color-clear-red);
}

.nav-link {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--color-dark);
    padding: 0.5rem 1rem;
}

.btn-cancel {
    flex: 1;
    padding: 0.75rem;
    max-width: 150px;
}

.btn-danger {
    padding: 0.75rem 2rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    max-width: 230px;
}

.btn-big {
    padding: var(--spacing-sm) var(--spacing-lg);
}

.btn-lt {
    font-weight: normal;
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs);
}

/* ============================================
CONTAINER
============================================ */

.container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    text-align: center;
}

.container-2c {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: var(--spacing-lg) auto;
}

.container-lg {
    max-width: 600px;
    margin: var(--spacing-lg) auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.container-btn {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    justify-self: center;
    align-self: center;
}

.container-item {
    border: 1px solid var(--color-blue);
    border-radius: 0.5rem;
    padding: var(--spacing-md);
    transition: var(--transition);
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.container-item:hover {
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.15);
}

.container-preview-book {
    display: grid;
    gap: var(--spacing-sm);
}

.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.actions {
    display: flex;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    justify-self: center;
    align-self: center;
}

.auth-box {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    border: 2px solid var(--color-blue);
    padding: var(--spacing-lg);
    border-radius: 0.75rem;
}

.auth-box h2 {
    align-self: flex-start;
}

.card {
    display: grid;
    gap: var(--spacing-md);
    border: 2px solid var(--color-blue);
    border-radius: var(--spacing-xs);
    padding: var(--spacing-lg);
    margin: auto;
}

.card-nm {
    display: grid;
    gap: var(--spacing-md);
    border: 2px solid var(--color-blue);
    border-radius: var(--spacing-xs);
    padding: var(--spacing-sm);
}

.card-preview {
    border-radius: 0.75rem;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: auto;
    border: 1px solid var(--color-border);
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.1);
}

.card-preview h3 {
    min-height: 80px;
    padding: var(--spacing-xs);
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.preview-img {
    height: 300px;
    width: auto;
}

.preview-img img {
    height: 100%;
    width: 100%;
    object-fit: cover;
}

.border-2px {
    border: 2px solid var(--color-blue);
    padding: var(--spacing-lg);
    border-radius: 0.75rem;
}

.title-lg {
    font-size: var(--font-size-lg);
    font-weight: bold;
}

.books-list {
    display: grid;
    gap: var(--spacing-md);
}

.book-row {
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    display: grid;
    grid-template-columns: 10px 80px 2fr 2fr 1fr;
    gap: var(--spacing-md);
    align-items: center;
    transition: var(--transition);
    border: var(--color-blue) 1px solid;
}

.book-row:hover {
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.15);
}

.book-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-lg);
}

.book-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: start;
}

.book-title {
    font-weight: bold;
    color: var(--color-dark)
}

.book-meta {
    display: grid;
    gap: var(--spacing-xs);
    text-align: start;
    color: var(--color-gray);
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm);
}

.book-cover-mini {
    width: 80px;
    height: auto;
    border-radius: 0.5rem;
}

.center-link {
    text-decoration: none;
    cursor: pointer;
    align-self: center;
}

.muted-italic {
    color: var(--color-gray);
    font-style: italic;
}

.management-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) auto;
    width: 640px;
}

.management-card {
    padding: var(--spacing-sm);
    border-radius: 0.75rem;
    border: 2px solid var(--color-blue);
    transition: var(--transition);
    display: grid;
    justify-content: center;
    gap: var(--spacing-md);
    max-width: 300px;
}

.management-card:hover {
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.1);
}

.management-card a {
    font-weight: bold;
    color: var(--color-blue);
    font-size: var(--font-size-xl);
    transition: var(--transition);
    text-decoration: none;
}

.management-card a:hover {
    color: var(--color-clear-blue);
}

.management-card span {
    display: inline-block;
    background-color: var(--color-blue);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0.5rem;
    font-size: var(--font-size-lg);
    font-weight: bold;
    width: fit-content;
    justify-self: center;
}

.profile-field {
    display: grid;
    grid-template-columns: 200px 1fr;
    border: 2px solid var(--color-blue);
    border-radius: 0.75rem;
    padding: var(--spacing-sm);
}

.profile-value {
    display: flex;
    justify-content: space-between;
}

.flex-center {
    display: flex;
    align-self: center;
}

.flex-start {
    display: flex;
    align-self: flex-start;
    gap: var(--spacing-sm);
}

.form-field {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-sm);
    align-items: center;
    border: 1px solid var(--color-blue);
    border-radius: 0.5rem;
    padding: var(--spacing-xs);
}

.warning-box {
    background-color: var(--color-clear-red);
    border: 2px solid var(--color-red);
    padding: var(--spacing-sm);
    border-radius: 0.5rem;
    width: fit-content;
    align-self: center;
}

/* ============================================
   RESPONSIVE DESIGN FOR TABLET
   ============================================ */
@media (max-width: 1024px) {

    section:first-of-type {
        max-height: 50px;
    }

    .card-nm, .book-row, .border-2px, .container-item {
        padding: var(--spacing-xs);
        gap: var(--spacing-xs);
    }

    .book-grid, .items-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .preview-img {
        height: 200px;
    }

    .book-meta {
        padding: var(--spacing-xs);
    }
}

/* ============================================
   RESPONSIVE DESIGN FOR PHONE
   ============================================ */
@media (max-width: 768px) {

    body, .nav-link {
        font-size: var(--font-size-sm);
    }

    section {
        padding: var(--spacing-xs);
    }

    nav {
        padding: 0 0.5rem;
    }

    form {
        gap: var(--spacing-xs);
        align-items: center;
    }
    
    .nav-link {
        padding: var(--spacing-xs);
    }

    #home-link-text {
        display: none;
    }

    h1 {
        font-size: var(--font-size-lg);
    }

    h2 {
        font-size: var(--font-size-base);
    }

    h3 {
        font-size: var(--spacing-sm);
    }

    .container {
        gap: var(--spacing-sm);
    }

    .book-cover-mini {
        display: none;
    }

    .book-row {
        grid-template-columns: 10px 2fr 1fr;
    }

    .book-meta div:nth-child(2) {
        display: none;
    }

    .date {
        display: none;
    }

    .book-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }

    .book-content img {
        max-height: 180px;
        justify-self: center;
    }

    .book-info {
        gap: var(--spacing-xs);
    }

    .book-grid {
        grid-template-columns: 95%;
        justify-content: center;
    }

    .actions {
        gap: 8px;
    }

    .card {
        padding: var(--spacing-xs);
    }

    .form-field {
        border: none;
        grid-template-columns: unset;
        gap: unset;
    }

    .btn {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs);
    }

    .message-success,
    .message-error,
    .message-warning,
    .message-info {
        padding: var(--spacing-xs);
        border-radius: 0.5rem;
        border: 2px solid var(--color-blue);
    }

    .management-grid {
        grid-template-columns: unset;
        justify-content: center;
        width: inherit;
        gap: var(--spacing-sm);
    }

    .management-card {
        display: flex;
    }

    .management-card a {
        align-self: center;
    }
}