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

:root {
    --cyan: #00B4FF;
    --dark: #22262D;
    --text: #1D2129;
    --text-light: #64748B;
    --border: #E2E8F0;
    --bg: #F3F7FA;
    --white: #ffffff;
    --card-bg: #F8FAFC;
    --success: #10B981;
    --radius: 12px;
    --transition: all 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    color: var(--text);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3 { font-weight: 700; line-height: 1.25; color: var(--text); }
h1 { font-size: clamp(2rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; }

/* ===== HEADER ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
}

.header-inner {
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-logo img { height: 36px; display: block; }

.header-back {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-light);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}
.header-back:hover { color: var(--cyan); }
.header-back svg { flex-shrink: 0; }

/* ===== HERO ===== */
.hero {
    background: var(--bg);
    padding: 80px 24px 60px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(0,180,255,0.1);
    color: var(--cyan);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 6px 16px;
    border-radius: 99px;
    margin-bottom: 20px;
    border: 1px solid rgba(0,180,255,0.2);
}

.hero h1 { margin-bottom: 16px; }
.hero h1 span { color: var(--cyan); }

.hero-desc {
    color: var(--text-light);
    font-size: 17px;
    max-width: 540px;
    margin: 0 auto 36px;
    line-height: 1.7;
}

/* ===== BUTTON ===== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--dark);
    color: var(--white);
    font-family: 'Poppins', sans-serif;
    font-size: 15px;
    font-weight: 600;
    padding: 14px 28px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(34,38,45,0.15);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(34,38,45,0.2); }
.btn-primary:active { transform: translateY(0); }

/* ===== FORM SECTION ===== */
.form-section {
    padding: 60px 24px 80px;
    background: var(--white);
}

.form-container {
    max-width: 700px;
    margin: 0 auto;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 48px 52px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.04);
}

.form-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}
.form-subtitle {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 36px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 22px;
}

.form-group label {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    color: var(--text);
    margin-bottom: 8px;
}

.form-group .field-hint {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 6px;
    font-style: italic;
}

.form-group input,
.form-group textarea {
    font-family: 'Poppins', sans-serif;
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 18px;
    outline: none;
    transition: var(--transition);
    width: 100%;
}

.form-group textarea { resize: vertical; min-height: 140px; }

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(0,180,255,0.12);
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: #94A3B8; }

.form-group .optional-badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 600;
    color: var(--text-light);
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 2px 8px;
    border-radius: 99px;
    margin-left: 6px;
    text-transform: none;
    letter-spacing: 0;
    vertical-align: middle;
}

.form-submit { margin-top: 8px; width: 100%; justify-content: center; font-size: 16px; padding: 16px; }

/* ===== MESSAGES FEEDBACK ===== */
.form-feedback {
    display: none;
    margin-top: 20px;
    padding: 18px 22px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    text-align: center;
}
.form-feedback.success {
    background: rgba(16,185,129,0.1);
    color: #065f46;
    border: 1px solid rgba(16,185,129,0.3);
}
.form-feedback.error {
    background: rgba(239,68,68,0.08);
    color: #991b1b;
    border: 1px solid rgba(239,68,68,0.2);
}
.form-feedback.show { display: block; }

/* Spinner sur le bouton */
.btn-primary.loading { opacity: 0.7; pointer-events: none; }

/* ===== CONFIRMATION CARD ===== */
.confirmation-card {
    display: none;
    text-align: center;
    padding: 48px 32px;
}
.confirmation-card.show { display: block; }
.confirmation-icon {
    width: 72px;
    height: 72px;
    background: rgba(16,185,129,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}
.confirmation-icon svg { color: var(--success); }
.confirmation-card h2 { margin-bottom: 12px; }
.confirmation-card p { color: var(--text-light); max-width: 400px; margin: 0 auto; }

/* ===== FOOTER ===== */
.site-footer {
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 24px;
    text-align: center;
    font-size: 13px;
    color: var(--text-light);
}
.site-footer a { color: var(--cyan); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* ===== RESPONSIVE ===== */
@media (max-width: 640px) {
    .form-container { padding: 32px 24px; }
    .form-row { grid-template-columns: 1fr; gap: 0; }
    .hero { padding: 60px 20px 40px; }
}