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var(--color-border);border-radius:8px;font-size:14px}.add-student-modal__input:focus{outline:none;border-color:var(--color-brand)}.add-student-modal__input:disabled{background:var(--color-bg);color:var(--color-text-muted)}.add-student-modal__error{margin:0;font-size:13px;color:var(--color-danger)}.add-student-modal__actions{display:flex;gap:10px;margin-top:4px}.add-student-modal__btn{flex:1}:root{--color-brand: #2E7D32;--color-brand-soft: #E9F3EA;--color-study-planned: #A8D9B0;--color-study-completed: #2E7D32;--color-selection: rgba(46, 125, 50, .16);--color-fixed: #A0AEC0;--color-success: #4CAF50;--color-danger: #E5484D;--color-bg: #F8F9FC;--color-card: #FFFFFF;--color-border: #E5E7EF;--color-text-muted: #9CA3AF;--color-text: #1F2024}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Apple SD Gothic Neo,Noto Sans 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