/* ===== VARIABLES & THEME LAVA ===== */
:root {
    --lave: #FF4500;
    --lave-claire: #FF8C00;
    --lave-glow: #CC3300;
    --noir-volcan: #0A0A0A;
    --noir-roche: #151515;
    --noir-bord: #252525;
    --texte: #F2F2F2;
    --texte-cendres: #808080;
}

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

body {
    background-color: var(--noir-volcan);
    color: var(--texte);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    height: 100vh; 
    display: flex;
    flex-direction: column;
    overflow: hidden; 
}

/* ===== EN-TETE ===== */
header {
    flex-shrink: 0; 
    background: var(--noir-roche);
    border-bottom: 3px solid var(--lave);
    padding: 15px 20px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
}

.nom {
    font-size: 1.8em;
    font-weight: bold;
    color: var(--lave-claire);
    text-shadow: 0 0 10px var(--lave);
    letter-spacing: 3px;
    text-transform: uppercase;
}

header p {
    font-size: 0.9em;
    color: var(--texte-cendres);
    margin-top: 5px;
}

/* ===== ZONE DE TRAVAIL ===== */
main {
    flex: 1; 
    display: flex;
    flex-direction: column;
    padding: 15px;
    gap: 15px;
    min-height: 0; 
}

.zone-saisie {
    flex-shrink: 0;
    background: var(--noir-roche);
    border: 1px solid var(--noir-bord);
    border-radius: 8px;
    padding: 15px;
    text-align: center;
}

.btn-envoyer {
    padding: 10px 25px;
    background: linear-gradient(to right, #8B0000, var(--lave));
    color: white;
    border: none;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    text-transform: uppercase;
    transition: 0.3s ease;
}

.btn-envoyer:hover {
    box-shadow: 0 0 15px var(--lave);
    filter: brightness(1.2);
}

/* ===== PANNEAU DU LECTEUR PDF ===== */
.panneau-unique {
    flex: 1; 
    background: var(--noir-roche);
    border-radius: 12px;
    border: 1px solid var(--noir-bord);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.barre-lecture {
    flex-shrink: 0;
    background: #000;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--lave);
}

.controles {
    display: flex;
    gap: 10px;
    align-items: center;
}

.navigation-directe {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--noir-bord);
    padding: 6px 15px;
    border-radius: 20px;
}

.navigation-directe input {
    width: 55px;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--lave);
    color: white;
    text-align: center;
    font-weight: bold;
    outline: none;
}

.navigation-directe span {
    color: var(--texte-cendres);
    font-size: 0.9em;
}

.btn-aller {
    background: var(--lave);
    color: white;
    border: none;
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 0.8em;
    font-weight: bold;
    cursor: pointer;
}

.btn-nav {
    background: var(--noir-bord);
    color: white;
    border: 1px solid var(--lave);
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
}

.btn-audio {
    background: transparent;
    color: white;
    border: 1px solid var(--lave);
    padding: 8px 18px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    min-width: 140px;
}

.btn-audio:hover, .btn-nav:hover, .btn-aller:hover {
    background: var(--lave-glow);
    border-color: var(--lave-claire);
}

.volume-box {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--lave);
}

input[type="range"] {
    accent-color: var(--lave);
    cursor: pointer;
    width: 100px;
}

#lecteur-pdf {
    flex: 1; 
    border: none;
    background: #525659;
}

/* ===== FOOTER ===== */
footer {
    flex-shrink: 0;
    text-align: center;
    padding: 10px;
    color: var(--texte-cendres);
    font-size: 0.8em;
    background: var(--noir-roche);
    border-top: 1px solid var(--noir-bord);
}